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Sensi UP500W vs Sensi ST55U: 104 Highlights & 21 Differences — So, Which Thermostats Actually Works Better

Learn about standout features and choose the perfect Sensi thermostat for your setup. From depth, mounting type, wall plate & detachable unit to real user feedback, we broke down the differences between Sensi UP500W and Sensi ST55U in this clear, side-by-side thermostats comparison.

60 Points
Sensi UP500W
67 Points
Sensi ST55U
vs

Highlights 151

No extras. Just what matters.
60 Points
vs
67 Points

Why is Sensi UP500W better than Sensi ST55U ?

Scroll down for more facts

Sensi UP500W vs Sensi ST55U: A Smart Thermostat Face-Off for Modern Homes

When it comes to upgrading residential HVAC systems with smart thermostats, the Sensi UP500W and Sensi ST55U present very similar core offerings that appeal to homeowners seeking programmable control, smart home integration, and reliable connectivity. Both models support voice assistant compatibility, enable integration with IFTTT, and provide cloud-based remote access. Designed primarily for residential use, they work well with gas furnaces, boilers, and multi-stage heating systems as well as central air conditioning and heat pumps.

Despite their shared capabilities, such as multi-stage heating and eco-friendly features, there are meaningful differences that influence installation, user experience, and durability. The UP500W sports a notably pared-down depth and a detachable unit aimed at ease of installation, while the ST55U focuses on providing a larger, brightness-adjustable display and longer battery life. Understanding these nuances helps pinpoint the best thermostat for your specific setup and lifestyle.

Sleek Simplicity and Safety with the Sensi UP500W

The Sensi UP500W shines in its remarkably slim design, coming in at just 0.9 inches deep. This sleek profile, coupled with its detachable unit, makes installation, maintenance, and wall fitting less cumbersome compared to bulkier units. This form factor is especially attractive when working in tight spaces or aiming for a minimalist wall appearance.

Safety is another area where the UP500W stands out. It is equipped with overheat protection, offering an additional layer of security to prevent potential thermostat-related damage or malfunctions; a feature absent in the ST55U. For homeowners mindful of safety compliance, this can be a deciding factor.

On top of that, the UP500W handles harsh environmental conditions better, supporting an impressive humidity range of 5-95%. This wide tolerance can translate into consistent functionality in places with fluctuating humidity, such as basements or sunrooms.

Lastly, the UP500W includes useful features like eco mode, child lock, and control lock, ensuring both safety and energy savings without sacrificing control. The unit runs on standard AA batteries with about a year-long battery life, which is respectable for most household needs.

Comfort and Convenience Through the Lens of the Sensi ST55U

The Sensi ST55U prioritizes user experience with a slightly larger 3.5-inch display that supports adjustable brightness. This flexibility can reduce eye strain and enhance visibility in varying lighting conditions, something the UP500W's fixed 3-inch display lacks.

Battery life is another strong suit for the ST55U, lasting an estimated 24 months on AA batteries, which cuts down maintenance frequency significantly. This reliability is beneficial for users who prefer less frequent battery changes over convenience.

While the ST55U carries a deeper profile at 4.76 inches and lacks a detachable unit, it integrates nicely into homes with more substantial mounting needs thanks to its sturdy wall plate design. It also matches the UP500W's compatibility with various HVAC systems, including boilers and central or split systems, and features the same eco and child lock controls.

Maintenance alert features keep the user informed about upkeep needs, echoing the UP500W's notification capabilities. The ST55U also complies with FCC standards and covers a solid operating humidity range of up to 90%, which suffices for many indoor applications.

Quick Take

The Sensi UP500W wins with its slim, detachable construction, overheat protection for added safety, and wider humidity tolerance, ideal for homes that prioritize installation ease and durability. Meanwhile, the Sensi ST55U excels in screen comfort with a larger, brightness-adjustable display and twice the battery lifespan, satisfying homeowners keen on user-friendly operation and low-maintenance care.

Bottom Line: Which Sensi Thermostat Fits You Best?

Choosing between the Sensi UP500W and Sensi ST55U comes down to your priorities. If you want a modern, low-profile device with enhanced safety features and broader environmental resilience, the UP500W is a smart pick despite its $10 higher price tag ($109.01 at Sensi Official Store). For those who favor a richer display experience, longer battery life, and a more budget-conscious option, the ST55U ($99.99 at Amazon) delivers excellent value and consistent performance.

Ultimately, for most residential users, the ST55U balances comfort and cost effectively, while the UP500W serves best in setups demanding simplified installation and enhanced thermostat longevity in tougher environments.

Verdict

  • Winner: Sensi UP500W - Offers superior installation ease with its slim, detachable design, wider humidity range, and valuable safety feature of overheat protection.
  • Runner-up: Sensi ST55U - Provides a better user interface with a larger, adjustable display and longer battery life at a slightly lower price.

Comparisons & Facts 151

Side by side. The numbers. The features. No drama.

Can’t decide between Sensi UP500W and Sensi ST55U? This in-depth thermostats breakdown highlights what makes each product unique — from standout features and hidden quirks to pricing, performance, and what actual users are saying.

General Information 17

Thermostat Category

What category of thermostat is this?

62 Sensi UP500W 0 Votes Programmable

54 Sensi ST55U 0 Votes Programmable

Sensi UP500W
vs
Sensi ST55U
Thermostat Category

Both the Sensi UP500W and Sensi ST55U fall within the Programmable thermostat category. This means users can set schedules and timers on either device, providing flexible temperature management across both models.

Indicates the functional category of the thermostat.

Intended Use

What is the intended use of this thermostat?

32 Sensi UP500W 0 Votes Residential

24 Sensi ST55U 0 Votes Residential

Sensi UP500W
vs
Sensi ST55U
Intended Use

The intended use for both Sensi UP500W and Sensi ST55U is Residential, making them equally suitable for home heating and cooling control. This specification doesn't influence preference as both serve residential environments.

Specifies the primary usage environment.

Country of Manufacture

Where is this thermostat manufactured?

72 Sensi UP500W 0 Votes US

94 Sensi ST55U 0 Votes US

Sensi UP500W
vs
Sensi ST55U
Country of Manufacture

Manufactured in the US, both the Sensi UP500W and Sensi ST55U offer domestically produced quality. This doesn't differentiate them but may appeal to buyers prioritizing US-made products.

Indicates the country where the thermostat is manufactured or assembled.

Color

What color is the thermostat?

32 Sensi UP500W 0 Votes White

74 Sensi ST55U 1 Votes White

Sensi UP500W
vs
Sensi ST55U
Color

Both the Sensi UP500W and Sensi ST55U thermostats come in White color, offering a clean and neutral look that fits most home décors. There's no difference here, so color won't be a deciding factor between these two models.

Indicates the exterior color of the thermostat for visual and aesthetic matching.

Honestly, both have the same color, but I dig the style of Sensi ST55U more.

See more

Programmability Type

What type of programmability does it support?

42 Sensi UP500W 0 Votes 7-Day

74 Sensi ST55U 0 Votes 7-Day

Sensi UP500W
Sensi UP500W

Programmability type is 7-day, enabling customized schedules for each day of the week.

Sensi ST55U
Sensi ST55U

The thermostat supports 7-Day programmability, allowing users to set individual schedules for each day of the week for personalized comfort and efficiency.

Defines scheduling and automation capability.

Control Method

How do you control this thermostat?

82 Sensi UP500W 0 Votes App

94 Sensi ST55U 0 Votes App

Sensi UP500W
Sensi UP500W

Control is primarily through an app, allowing convenient adjustments from a smartphone or tablet.

Explains how users interact with the thermostat.

Smart Thermostat

Is this a smart thermostat?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

It is a smart thermostat, providing advanced control features such as programming, remote access, and integration with smart home ecosystems.

Indicates whether the thermostat has smart connectivity features.

Language Support

What languages are supported?

69 Sensi UP500W 0 Votes English, Spanish, French

94 Sensi ST55U 0 Votes English

Sensi UP500W
Sensi UP500W

This product supports English, Spanish, and French languages to accommodate diverse users.

Lists supported display or app languages.

Release Year

What year was this thermostat released?

7 Sensi UP500W 0 Votes 2013

56 Sensi ST55U 0 Votes 2014

Sensi ST55U
Sensi ST55U

The device was released in the year 2014, indicating the generation and technology era of the thermostat.

Indicates the year the thermostat model was officially released to the market.

Voice Assistant

Does it support voice assistants?

Yes 1 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Voice Assistant

Voice Assistant support is available in both Sensi UP500W and Sensi ST55U, allowing for convenient voice commands with smart home systems. Since both support this feature, users can expect voice control on either thermostat.

Indicates compatibility with voice assistants.

Loving that the Sensi UP500W has voice control, super handy!

See more

Product Type

What type of product is this?

12 Sensi UP500W 0 Votes Thermostat

44 Sensi ST55U 0 Votes Thermostat

Defines the core product classification.

Installation Location

Where can this thermostat be installed?

42 Sensi UP500W 0 Votes Indoor

44 Sensi ST55U 0 Votes Indoor

Describes where the thermostat is designed to be installed.

Physical & Installation 17

Depth

What is the depth of the thermostat?

0.9 inch 0 Votes
Sensi UP500W
4.76 inch 0 Votes
Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Depth

The Depth of the Sensi UP500W is 0.9 inches, making it remarkably slim, while the Sensi ST55U is deeper at 4.76 inches. The UP500W's slender profile is better suited for minimal wall protrusion and sleek aesthetics.

Measures how far the thermostat protrudes from the wall.

Wall Plate

Is a wall plate included?

Yes 1 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Wall Plate

Both thermostats include a Wall Plate, which simplifies installation and hides wall imperfections. Installation ease in this regard is similar across the Sensi UP500W and the Sensi ST55U.

Indicates whether a wall plate is included.

Sensi UP500W's wall plate is a big plus for easy installation.

See more

Mounting Type

How is the thermostat mounted?

42 Sensi UP500W 0 Votes Wall-Mounted

94 Sensi ST55U 0 Votes Wall-Mounted

Sensi UP500W
vs
Sensi ST55U
Mounting Type

Both thermostats feature Wall-Mounted mounting types, ensuring easy installation on existing wall spaces. Neither model offers alternative mounting options, so choice depends on similar installation requirements.

Specifies how the thermostat is mounted.

Detachable Unit

Is the unit detachable?

Yes 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Detachable Unit

The Sensi UP500W has a Detachable Unit, which facilitates easier maintenance or installation, whereas the Sensi ST55U does not. This feature makes the UP500W more convenient for users valuing easy device handling.

Shows if the unit can be detached from base.

Tamper Resistant Design

Is it tamper resistant?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Tamper Resistant Design

Neither the Sensi UP500W nor the Sensi ST55U offers tamper-resistant design, which may be relevant for households with children. This similarity suggests both require careful placement to avoid accidental adjustments.

Indicates resistance to unauthorized adjustment.

Width

What is the width of the thermostat?

5.9 inch 0 Votes
Sensi UP500W
6.42 inch 0 Votes
Sensi ST55U

Sensi UP500W
Sensi UP500W

The thermostat measures 5.9 inch in width, which is approximately 15.0 cm wide, a size suitable for most standard wall spaces.

Indicates the horizontal size of the thermostat.

Height

What is the height of the thermostat?

3.75 inch 0 Votes
Sensi UP500W
1.89 inch 0 Votes
Sensi ST55U

Sensi UP500W
Sensi UP500W

This thermostat measures 3.75 inch in height, which is approximately 9.5 cm tall.

Indicates the vertical size of the thermostat.

Weight

How much does the thermostat weigh?

0.5 lbs 0 Votes
Sensi UP500W
1.22 lbs 0 Votes
Sensi ST55U

Sensi UP500W
Sensi UP500W

The weight of the thermostat is 0.5 lb which is approximately 0.23 kg, indicating a lightweight unit.

Shows how heavy the thermostat unit is.

Trim Plate Compatibility

Is it compatible with trim plates?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

Trim plate compatibility facilitates neat installation by fitting into trim plates that cover wall openings.

Shows if trim plates can be added for coverage.

Installation Difficulty Level

How difficult is installation?

0 Sensi UP500W 0 Votes Easy

94 Sensi ST55U 0 Votes Easy

Sensi UP500W
Sensi UP500W

Installation difficulty is rated as easy, suitable for most users with basic DIY skills.

Rates how complex installation is.

Surface Mount

Does it support surface mounting?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Surface Mount installation is supported, meaning the thermostat mounts on the wall surface rather than being recessed.

Indicates surface mount compatibility.

Installation Accessories

Are installation accessories included?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Installation accessories are included to facilitate the thermostat mounting and setup process.

Confirms inclusion of mounting hardware.

Display & Controls 18

Display Size

How large is the display?

3 inch 0 Votes
Sensi UP500W
3.5 inch 1 Votes
Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Display Size

Display Size is 3 inches on the Sensi UP500W and slightly larger at 3.5 inches on the Sensi ST55U. A bigger display on the ST55U improves readability, making it more suitable for users who prefer larger interfaces.

Indicates the diagonal size of the display.

Display size on the Sensi ST55U is kinda bigger, feels more modern.

See more

Control Lock

Is there a control lock feature?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Control Lock

Control Lock is offered on both the Sensi UP500W and Sensi ST55U thermostats, securing settings from unintended changes. This feature favors either device equally for users concerned with locking thermostat controls.

Prevents unauthorized setting changes.

Child Lock

Does it have a child lock?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Child Lock

Child Lock is enabled on both the Sensi UP500W and Sensi ST55U, helping prevent accidental settings changes. This safety feature is equally robust across both models, ideal for homes with children.

Prevents accidental changes by children.

Adjustable Brightness

Can you adjust the brightness?

No 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Adjustable Brightness

Adjustable Brightness is unavailable on the Sensi UP500W but present on the Sensi ST55U. The ST55U's adjustable display brightness allows for more comfortable viewing in various lighting conditions, making it preferable if display customization matters.

Allows users to change screen brightness.

Proximity Activation

Does the display activate by proximity?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Proximity Activation

Proximity Activation is not supported by either the Sensi UP500W or Sensi ST55U, meaning the screen won’t automatically brighten when you approach. Both models require manual interaction to light up the display.

Activates the screen when someone approaches.

Physical Buttons

Does it have physical buttons?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

Physical buttons are present, complementing touchscreen controls for tactile input.

Sensi ST55U
Sensi ST55U

Physical Buttons are present, providing tactile control options in addition to any touch or app interfaces.

Indicates presence of tactile buttons.

Display Type

What type of display does it use?

32 Sensi UP500W 0 Votes LCD

74 Sensi ST55U 0 Votes LCD

Sensi UP500W
Sensi UP500W

Equipped with an LCD display, providing clear visuals with energy efficiency compared to older display types.

Defines the underlying display technology.

Backlight

Is the display backlit?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

The thermostat has backlighting which improves visibility in low light conditions.

Indicates if the display is backlit.

Always-On Display

Is the display always on?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

The always-on display ensures the thermostat screen is constantly visible for easy temperature reading without needing to touch or activate the unit.

Shows key info without waking the device.

Screen Resolution

What is the screen resolution quality?

12 Sensi UP500W 0 Votes Standard

44 Sensi ST55U 0 Votes Standard

Sensi UP500W
Sensi UP500W

Screen resolution is standard, providing clear and readable display without the higher detail of HD variants.

Describes the visual clarity and sharpness of the display.

Display Customization

Can the display be customized?

No 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Display Customization is available, allowing users to adjust the visual settings for readability and personal preference.

Allows users to customize on-screen info.

Touchscreen

Does it have a touchscreen?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Shows whether touch input is supported.

Connectivity & Smart Features 17

Cloud Connectivity

Does it connect to the cloud?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Cloud Connectivity

Both Sensi UP500W and Sensi ST55U support Cloud Connectivity, enabling remote control and monitoring through associated apps. This feature gives equal smart control benefits to both devices.

Shows whether cloud services are used.

IFTTT

Is IFTTT supported?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
IFTTT

IFTTT compatibility is included in both the Sensi UP500W and Sensi ST55U, allowing automation across a wide range of smart devices. This makes both excellent choices for users wanting flexible smart home routines.

Enables automation with third-party services.

Zigbee

Does it support Zigbee?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Zigbee

Zigbee support is not available on either the Sensi UP500W or the Sensi ST55U. Users depending on Zigbee smart home protocols will find neither model compatible.

Indicates compatibility with Zigbee networks.

Z-Wave

Does it support Z-Wave?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Z-Wave

Both thermostats do not support Z-Wave connectivity, indicating they rely on other wireless standards for smart home integration. This limits options for users specifically requiring Z-Wave compatibility.

Indicates compatibility with Z-Wave systems.

Wi-Fi Band

Which Wi-Fi bands are supported?

32 Sensi UP500W 0 Votes 2.4GHz

27 Sensi ST55U 0 Votes 2.4GHz

Sensi UP500W
Sensi UP500W

Wi-Fi band operates on the 2.4GHz frequency, common for reliable range and device compatibility.

Sensi ST55U
Sensi ST55U

Wi-Fi connectivity operates on the 2.4 GHz band, which offers good range and compatibility with most home wireless networks.

Specifies supported Wi-Fi frequency bands.

Wi-Fi Connectivity

Does the thermostat support Wi-Fi connectivity?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

Wi-Fi connectivity enables remote control and integration with smart devices through wireless home networks.

Indicates whether the thermostat can connect to a Wi-Fi network for smart features and remote control.

Local Control Capability

Can it be controlled locally without internet?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

Local control capability means you can adjust settings directly on the thermostat without needing an app or internet connection.

Indicates whether local control works without internet.

Data Encryption

Is data encrypted?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

Data encryption protects user data and communications, enhancing security.

Protects transmitted user data.

User Account Required

Is a user account required?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

A user account is required to utilize full device functionality, implying cloud-based features and personalized settings.

Indicates if an online account is mandatory.

Multi-User

Can multiple users access it?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
Sensi UP500W

Multi-user support allows multiple people to access and control the thermostat settings.

Allows multiple users to access controls.

Bluetooth Connectivity

Does it support Bluetooth?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Shows whether Bluetooth connectivity is available.

Thread

Does it support Thread?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Indicates support for the Thread protocol.

Sensors & Monitoring 18

Historical Data Tracking

Can it track historical data?

Yes 1 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Historical Data Tracking

Historical Data Tracking is supported by both Sensi UP500W and Sensi ST55U, enabling users to analyze past temperature and usage data. This parity benefits users seeking insight into their energy consumption patterns.

Stores past environmental data.

Historical data tracking is a must-have, glad Sensi UP500W has it.

See more

Motion Sensor

Does it have a motion sensor?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Motion Sensor

Neither the Sensi UP500W nor the Sensi ST55U have Motion Sensors, so wave or presence detection features are absent. This means interaction depends solely on physical use in both models.

Detects movement near the thermostat.

Remote Sensor

Can it use remote sensors?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Remote Sensor

Remote Sensor support is absent in both thermostats, limiting temperature sensing to the installed unit only. This restricts temperature sensing options compared to models supporting remote sensors.

Indicates compatibility with external sensors.

Sensor Accuracy

How accurate are the sensors?

32 Sensi UP500W 0 Votes Standard

24 Sensi ST55U 0 Votes Standard

Sensi UP500W
vs
Sensi ST55U
Sensor Accuracy

Sensor Accuracy is standard on both thermostats, meaning comparable temperature sensing precision. Neither model offers high-precision sensors, making their accuracy levels similar for typical residential use.

Indicates how accurately the thermostat sensors measure conditions.

Humidity Range

What humidity range is supported?

Who knows? 0 Votes Sensi UP500W (Help us out by suggesting one!)

Who knows? 0 Votes Sensi ST55U (Help us out by suggesting one!)

Shows supported humidity measurement range.

Outdoor Temperature

Does it support outdoor temperature data?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

The thermostat supports an Outdoor Temperature sensor, which can provide external temperature data for enhanced heating and cooling decisions.

Allows use of outdoor temperature data.

Real-Time Monitoring

Does it offer real-time monitoring?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Real-Time Monitoring is available, enabling continuous tracking of environmental conditions and system performance for better control.

Provides live environmental data.

Temperature Sensor Type

What type of temperature sensor is used?

82 Sensi UP500W 0 Votes Digital

64 Sensi ST55U 0 Votes Digital

Defines the technology used to measure temperature.

Humidity Sensor

Does it measure humidity?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Indicates whether humidity is measured.

Occupancy Detection

Can it detect room occupancy?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Determines if people are present in the space.

Ambient Light Sensor

Does it detect ambient light?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Adjusts display or behavior based on light.

Proximity Sensor

Does it have a proximity sensor?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Detects nearby presence for wake-up actions.

Scheduling & Automation 18

Scheduling Type

What type of scheduling is available?

12 Sensi UP500W 0 Votes Manual

32 Sensi ST55U 0 Votes Manual

Sensi UP500W
vs
Sensi ST55U
Scheduling Type

Scheduling Type is Manual for both models, requiring users to program heating and cooling times themselves. Neither thermostat supports automatic scheduling, making user involvement necessary.

Defines how schedules are created and managed.

Eco Mode

Does it have an eco mode?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Eco Mode

Eco Mode is available on both Sensi UP500W and Sensi ST55U, helping optimize energy savings during operation. Both provide equal assistance in reducing energy consumption.

Reduces energy use automatically.

Sleep Mode

Is there a sleep mode?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Sleep Mode

Sleep Mode is unavailable on both the Sensi UP500W and Sensi ST55U, so special night-time operating modes are not supported. Both suit users who prefer manual schedule control.

Optimizes temperature for sleeping hours.

Smart Home Scenes

Does it support smart home scenes?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Smart Home Scenes

Smart Home Scenes integration is present on both thermostats, allowing them to be part of coordinated smart home routines. This feature is equally beneficial for users with comprehensive home automation setups.

Integrates with smart home scenes.

Scheduling Capability

Does it support scheduling?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

The device supports scheduling capability, enabling programmed temperature control throughout the day for energy savings.

Indicates whether scheduling is supported.

Weekly Scheduling

Can you set weekly schedules?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Weekly Scheduling is enabled, which allows programming temperature setpoints across a full week for tailored comfort.

Allows different schedules across the week.

Away Mode

Does it support away mode?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Away Mode is active, enabling the thermostat to maintain energy savings by adjusting temperature settings when the home is unoccupied.

Adjusts settings when occupants leave.

Temperature Presets

Are temperature presets available?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Temperature Presets are available for quick selection of common temperature settings, improving usability.

Allows quick switching between preset temps.

Automation Rules

Can automation rules be created?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Automation Rules are supported, allowing users to customize settings and integrate with smart home automation for enhanced convenience.

Enables rule-based automation logic.

Event-Based Triggers

Are event-based triggers supported?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Event-Based Triggers allow the thermostat to respond automatically to specific events or conditions, providing dynamic and efficient climate control.

Responds to events like occupancy changes.

Demand Response

Does it support demand response?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Demand Response capability is offered, allowing the thermostat to participate in utility programs to reduce energy usage during peak demand times.

Participates in utility demand programs.

Daily Scheduling

Can you set daily schedules?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Allows temperature changes by day.

HVAC Compatibility 18

Gas Furnace Compatibility

Does it support gas furnaces?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Gas Furnace Compatibility

Both thermostats support Gas Furnace Compatibility, making them apt for homes using gas heating systems. This equivalence assures reliability with common furnace types.

Indicates support for gas furnaces.

HVAC System Type

Which HVAC system types are supported?

Who knows? 0 Votes Sensi UP500W (Help us out by suggesting one!)

72 Sensi ST55U 0 Votes Central, Split

Sensi UP500W
vs
Sensi ST55U
HVAC System Type

The HVAC System Type information is unavailable for the Sensi UP500W but available as Central, Split for the Sensi ST55U. This suggests the ST55U explicitly supports central and split systems, making it a safer choice if this detail is critical.

Defines the general HVAC system types supported.

Cooling System Compatibility

What cooling systems are supported?

42 Sensi UP500W 0 Votes Central AC, Heat Pump

70 Sensi ST55U 0 Votes Central AC, Heat Pump

Sensi UP500W
vs
Sensi ST55U
Cooling System Compatibility

Cooling System Compatibility includes Central AC and Heat Pump for both the Sensi UP500W and Sensi ST55U, ensuring effective cooling control in standard HVAC systems. No difference here impacts cooling system suitability.

Indicates supported cooling system types.

Multi-Stage Heating

Does it support multi-stage heating?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Multi-Stage Heating

Multi-Stage Heating compatibility exists in both Sensi UP500W and Sensi ST55U, allowing support for advanced heating systems with multiple stages. Both are suitable for sophisticated HVAC setups.

Indicates support for multi-stage heating.

Boiler Compatibility

Is it compatible with boilers?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Boiler Compatibility

Both Sensi UP500W and Sensi ST55U offer Boiler Compatibility, enabling control of boiler heating systems. Users with boilers will find either thermostat appropriate for their needs.

Indicates compatibility with boiler systems.

Fan Control

Can it control the HVAC fan?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Fan Control is included, giving the user manual or automated control over the HVAC system fan operation.

Allows independent fan operation control.

Humidifier

Does it support a humidifier?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Humidifier support is included, allowing integration with compatible humidifier systems to maintain optimal indoor humidity levels.

Supports integrated humidifier control.

Heating System Compatibility

What heating systems are supported?

39 Sensi UP500W 0 Votes Furnace, Boiler, Heat Pump

41 Sensi ST55U 0 Votes Furnace, Boiler, Heat Pump

Indicates supported heating system types.

Heat Pump Compatibility

Does it support heat pumps?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Indicates support for heat pump systems.

Dual Fuel

Does it support dual fuel systems?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Supports dual-fuel HVAC configurations.

Multi-Stage Cooling

Does it support multi-stage cooling?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Indicates support for multi-stage cooling.

Dehumidifier

Does it support a dehumidifier?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Supports integrated dehumidifier control.

Power & Electrical 14

Battery Life

How long does the battery last?

12 months 0 Votes
Sensi UP500W
24 months 1 Votes
Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Battery Life

Battery Life is 12 months for the Sensi UP500W compared to a longer 24 months for the Sensi ST55U. The ST55U offers double the battery lifespan, making it more convenient by reducing battery changes.

Estimates how long batteries last under normal use.

Lowkey impressed by the battery life on the Sensi ST55U, lasts way longer.

See more

Battery Type

What type of battery is used?

62 Sensi UP500W 0 Votes AA

42 Sensi ST55U 0 Votes AA

Sensi UP500W
vs
Sensi ST55U
Battery Type

Both thermostats use AA batteries, facilitating easy battery replacement with common batteries readily available. This consistency benefits user convenience.

Specifies the battery format used.

Standby Power Usage

How much power is used in standby?

0.5 Watt 0 Votes
Sensi UP500W
0.5 Watt 0 Votes
Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Standby Power Usage

Standby Power Usage is 0.5 Watts for both Sensi UP500W and Sensi ST55U, indicating similar minimal power consumption when idle. This makes both equally energy-efficient in standby mode.

Indicates power draw when idle.

Operating Voltage Range

What voltage range can it operate in?

12 Sensi UP500W 0 Votes 20-30 VAC

54 Sensi ST55U 0 Votes 20-30 VAC

Sensi UP500W
vs
Sensi ST55U
Operating Voltage Range

Operating Voltage Range is the same for both thermostats at 20-30 VAC, allowing compatibility with standard HVAC power supplies. This uniformity ensures either unit fits typical voltage requirements.

Describes acceptable voltage range.

Power Failure Recovery

Does it recover after power failure?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Power Failure Recovery

Power Failure Recovery is supported by both Sensi UP500W and Sensi ST55U, enabling the thermostat to remember settings after power loss. This ensures reliability in maintaining programmed comfort.

Restores settings after outages.

Input Voltage

What input voltage is required?

24 Volt 0 Votes
Sensi UP500W
24 Volt 0 Votes
Sensi ST55U

Sensi ST55U
Sensi ST55U

The thermostat operates on a 24 Volt power supply typical for most HVAC systems.

Specifies required input voltage.

Power Frequency

What power frequency is supported?

60 Hz 0 Votes
Sensi UP500W
60 Hz 0 Votes
Sensi ST55U

Sensi ST55U
Sensi ST55U

The power frequency is specified as 60 Hz, which is standard for electrical systems in the United States.

Indicates supported electrical frequency.

Low Power Mode

Does it have a low power mode?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Low Power Mode helps reduce energy consumption during periods of inactivity or low demand, extending device energy efficiency.

Reduces power usage when idle.

Power Source

What is the power source?

52 Sensi UP500W 0 Votes Hardwired

34 Sensi ST55U 0 Votes Hardwired

Indicates how the thermostat receives power.

Battery Backup

Is there battery backup?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Maintains operation during power outages.

Power Consumption

How much power does it consume?

1 Watt 0 Votes
Sensi UP500W
1 Watt 0 Votes
Sensi ST55U

Measures power usage during operation.

Surge Protection

Is surge protection included?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Protects against electrical surges.

Safety, Compliance & Reliability 14

Maintenance Alerts

Are maintenance alerts provided?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Maintenance Alerts

Maintenance Alerts are available on both thermostats, providing reminders for upkeep to maintain performance. This helps users keep HVAC systems in optimal condition regardless of model choice.

Reminds users of maintenance needs.

Overheat Protection

Is overheat protection included?

Yes 0 Votes Sensi UP500W

No 1 Votes Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Overheat Protection

The Sensi UP500W provides Overheat Protection, enhancing safety by preventing heat-related device damage, while the Sensi ST55U does not offer this feature. This makes UP500W more suitable for safety-conscious users.

Protects device from overheating.

Ngl, Sensi ST55U looks a bit safer without overheat protection.

See more

Expected Lifespan

What is the expected lifespan?

10 years 0 Votes
Sensi UP500W
10 years 0 Votes
Sensi ST55U

Sensi UP500W
vs
Sensi ST55U
Expected Lifespan

Expected Lifespan is the same 10 years for both the Sensi UP500W and Sensi ST55U, suggesting similar durability and product warranty expectations between these models.

Estimates usable product lifespan.

Regulatory Compliance

What regulatory standards does it meet?

32 Sensi UP500W 0 Votes FCC

92 Sensi ST55U 0 Votes FCC

Sensi UP500W
vs
Sensi ST55U
Regulatory Compliance

Regulatory Compliance with FCC is confirmed for both Sensi UP500W and Sensi ST55U, ensuring they meet necessary federal communications standards. This compliance equalizes their regulatory reliability.

Indicates compliance with regulations.

Diagnostic Tools

Are diagnostic tools available?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Sensi ST55U
Sensi ST55U

Diagnostic Tools are included, helping users and technicians identify and resolve issues efficiently.

Provides tools for troubleshooting.

Operating Temperature Range

What is the operating temperature range?

57 Sensi UP500W 0 Votes 32-105°F

55 Sensi ST55U 0 Votes 32-105°F

Defines the ambient temperature range for safe operation.

Operating Humidity Range

What humidity range is supported?

82 Sensi UP500W 0 Votes 5-95%

32 Sensi ST55U 0 Votes 90%

Sensi UP500W
vs
Sensi ST55U
Operating Humidity Range

Operating Humidity Range is 5-95% for Sensi UP500W, offering a wide tolerance for humidity, whereas the Sensi ST55U supports up to 90%. UP500W is preferable for environments with higher humidity variability.

Specifies allowable humidity levels during operation.

Storage Temperature Range

What is the storage temperature range?

62 Sensi UP500W 0 Votes -20-120°F

72 Sensi ST55U 0 Votes -4-140°F

Indicates safe temperature range when not in use.

Electrical Safety Certification

What electrical safety certifications does it have?

40 Sensi UP500W 0 Votes UL, ETL

69 Sensi ST55U 0 Votes UL, CSA

Lists electrical safety certifications.

EMC Compliance

Is it EMC compliant?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Indicates electromagnetic compatibility compliance.

Fire Safety Rating

Does it meet fire safety requirements?

No 0 Votes Sensi UP500W

No 0 Votes Sensi ST55U

Indicates fire resistance or safety design.

Fail-Safe Mode

Does it have a fail-safe mode?

Yes 0 Votes Sensi UP500W

Yes 0 Votes Sensi ST55U

Ensures safe behavior during failure.

Surveys

Because hot takes deserve votes.

Temperature Accuracy

How accurate is this thermostat at maintaining the set temperature during daily use?

Extremely accurate — Within plus or minus 0.5 degrees
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Very accurate — Within plus or minus 1 degree
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Decently accurate — Within plus or minus 2 degrees
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Somewhat inconsistent — Within plus or minus 3 degrees
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Very inconsistent — More than plus or minus 3 degrees
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Response Speed to Temperature Changes

How quickly does this thermostat react after the temperature setting is adjusted?

Instant response — Under 30 seconds
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Quick response — 30 seconds to 1 minute
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Moderate response — 1 to 3 minutes
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Slow response — 3 to 5 minutes
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Very slow response — Over 5 minutes
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Ease of Setup and Installation

How easy is it to install and set up this thermostat for the first time?

Super easy and stress free — Finished in under 15 minutes
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Pretty straightforward — About 15 to 30 minutes
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Manageable with effort — Around 30 to 60 minutes
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Time consuming and confusing — 1 to 2 hours
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Extremely frustrating — Over 2 hours
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Ease of Daily Use

How easy is it to control and adjust this thermostat in everyday use?

Effortless and intuitive — No learning needed
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Mostly easy to use — Minor learning curve
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Usable but not smooth — Takes regular effort
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Often confusing — Requires frequent checking
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Hard to use — Causes daily frustration
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Smart Features and App Experience

How well do the smart features and mobile app work with this thermostat?

Smooth and reliable — No crashes or delays
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Mostly reliable — Rare glitches
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Usable but basic — Limited features
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Unreliable — Frequent bugs or delays
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Barely usable — Often fails to work
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Energy Efficiency and Savings

How much does this thermostat help reduce energy usage over time?

Major savings — Over 20 percent reduction
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Noticeable savings — 10 to 20 percent
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Some savings — 5 to 10 percent
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Minimal savings — Under 5 percent
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
No savings — No noticeable reduction
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Noise Level During Operation

How noticeable is the noise from this thermostat during normal operation?

Completely silent — No audible sound
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Very quiet — Barely noticeable
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Occasionally noticeable — Soft clicking sounds
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Often noticeable — Clearly audible sounds
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Annoyingly loud — Distracting noise
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Design and Display Appeal

How appealing is the look and display of this thermostat in a home environment?

Modern and premium — Looks high end
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Clean and stylish — Fits most interiors
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Simple and acceptable — Nothing special
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Outdated design — Feels old fashioned
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Unattractive look — Stands out poorly
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Durability and Build Quality

How durable does this thermostat feel with long term everyday use?

Very durable — Expected to last 10 years or more
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Solid build — Around 7 to 10 years
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Average quality — About 5 to 7 years
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Feels fragile — Roughly 3 to 5 years
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Very flimsy — Under 3 years
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Pricing and Value

How does the price of this thermostat feel compared to its overall features and performance?

Great value for money — Worth every dollar
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Pretty good price — Slightly above average
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Fair deal — Matches what you get
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Kinda pricey — Costs more than expected
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U
Crazy expensive — Not worth the price
0 Votes
Sensi UP500W
0 Votes
Sensi ST55U

Reviews 0

The good, the bad, and the brutally honest.

Average Rating

Sensi
Sensi
Sensi UP500W
Sensi UP500W
0 / 5 0 Reviews
Sensi
Sensi
Sensi ST55U
Sensi ST55U
0 / 5 0 Reviews

Discussions 0

Thoughts, takes, and hot debates.

Awards 0

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Collections 0

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More Thermostats 0

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Other Sensi Thermostats 5

Other Sensi Thermostats 0

Sensi UP500W
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Sensi UP500W
Sensi ST55U
Sensi
Sensi
Sensi ST55U
vs