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Sensi ST55 Facts: 149 Specifications & 96 Highlights

The Sensi ST55 thermostats comes packed with 149 useful specs & features — from general information, physical & installation, display & controls & connectivity & smart features to more. Here’s what smart shoppers are looking at on Techspotr.

67 Points
Sensi ST55

Highlights 96

No extras. Just what matters.
67 Points

Why is Sensi ST55 better than other thermostats ?

General Information

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Physical & Installation

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Display & Controls

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Connectivity & Smart Features

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Sensors & Monitoring

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Scheduling & Automation

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HVAC Compatibility

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Power & Electrical

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Safety, Compliance & Reliability

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Quick Take

The essentials that matter—nothing extra

A fast snapshot of the Sensi ST55, covering its standout specification and what you can expect right out of the box.

Sensi ST55
Sensi ST55

Sensi ST55 is a WiFi-enabled device designed to look and feel like a traditional thermostat while offering modern smart features. It is most recognized for its "no C-wire required" installation for most systems, which makes it a popular option for older homes.

Specifications & Facts 149

Specs measured. Drama avoided.

The Sensi ST55 thermostats is more than a price tag. Explore specs, real pros and cons, and see how it holds up next to similar thermostats — then add your own vote!

General Information 17

Sensi ST55 Thermostat Category

What category of thermostat is this?

95 Sensi ST55 0 Votes Smart

14 Thermostats in this range Non-Programmable

Sensi ST55
Sensi ST55

The thermostat qualifies as a smart device, integrating connectivity and automation for enhanced user experience and efficiency.

Indicates the functional category of the thermostat.

Sensi ST55 Intended Use

What is the intended use of this thermostat?

25 Sensi ST55 0 Votes Residential

12 Thermostats in this range Residential

Sensi ST55
Sensi ST55

This model is designed specifically for residential use, focusing on home comfort and energy management.

Specifies the primary usage environment.

Sensi ST55 Installation Location

Where can this thermostat be installed?

45 Sensi ST55 0 Votes Indoor

21 Thermostats in this range Indoor

Sensi ST55
Sensi ST55

Designed exclusively for indoor installation, suitable for controlled interior environments.

Describes where the thermostat is designed to be installed.

Sensi ST55 Programmability Type

What type of programmability does it support?

75 Sensi ST55 0 Votes 7-Day

9 Thermostats in this range 7-Day

Sensi ST55
Sensi ST55

Programmability for a full 7-day cycle enables distinct settings for every day, offering comprehensive energy management and comfort.

Defines scheduling and automation capability.

Sensi ST55 Smart Thermostat

Is this a smart thermostat?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

This device is a smart thermostat, meaning it offers advanced connectivity and automated management beyond basic programmable functions.

Indicates whether the thermostat has smart connectivity features.

Sensi ST55 Voice Assistant

Does it support voice assistants?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Voice assistant integration is supported, enabling voice commands for controlling the thermostat through compatible smart home systems.

Indicates compatibility with voice assistants.

Physical & Installation 17

Sensi ST55 Weight

How much does the thermostat weigh?

0.85 lbs 0Votes
Sensi ST55
0.58 lbs (Average)

Sensi ST55
Sensi ST55

The thermostat weighs 0.85 lbs (0.39 kg), making it lightweight and easy to handle during installation.

Shows how heavy the thermostat unit is.

Sensi ST55 Mounting Type

How is the thermostat mounted?

95 Sensi ST55 0 Votes Wall-Mounted

45 Thermostats in this range Wall-Mounted

Sensi ST55
Sensi ST55

This thermostat is designed to be mounted on a wall, a common and convenient placement option for user access and sensor accuracy.

Specifies how the thermostat is mounted.

Sensi ST55 Width

What is the width of the thermostat?

5 inch 0Votes
Sensi ST55
4.65 inch (Average)

Sensi ST55
Sensi ST55

The width of the thermostat is 5 inches (12.7 cm), providing a moderate footprint suitable for most wall spaces.

Indicates the horizontal size of the thermostat.

Sensi ST55 Depth

What is the depth of the thermostat?

1 inch 0Votes
Sensi ST55
3.72 inch (Average)

Sensi ST55
Sensi ST55

The thermostat has a depth of 1 inch (2.54 cm). This compact depth allows for an unobtrusive installation on standard walls.

Measures how far the thermostat protrudes from the wall.

Sensi ST55 Height

What is the height of the thermostat?

3.5 inch 0Votes
Sensi ST55
4.29 inch (Average)

Sensi ST55
Sensi ST55

The thermostat height is 3.5 inches (8.89 cm), contributing to a compact and unobtrusive wall presence.

Indicates the vertical size of the thermostat.

Sensi ST55 Installation Difficulty Level

How difficult is installation?

95 Sensi ST55 0 Votes Easy

38 Thermostats in this range Easy

Sensi ST55
Sensi ST55

Installation difficulty level is easy, indicating that typical users or technicians can install this thermostat without special tools or extensive expertise.

Rates how complex installation is.

Display & Controls 18

Sensi ST55 Display Size

How large is the display?

5 inch 0Votes
Sensi ST55
3.18 inch (Average)

Sensi ST55
Sensi ST55

The display size is 5 inches (12.7 cm), large enough for clear information presentation and easy interaction.

Indicates the diagonal size of the display.

Sensi ST55 Backlight

Is the display backlit?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Backlight is included to improve display readability in low light conditions without needing external lighting.

Indicates if the display is backlit.

Sensi ST55 Always-On Display

Is the display always on?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

An always-on display provides continuous visibility of settings and environmental data without the need to activate the screen manually.

Shows key info without waking the device.

Sensi ST55 Physical Buttons

Does it have physical buttons?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Physical buttons are available for user input, offering tactile control options alongside possible touchscreen or app interfaces.

Indicates presence of tactile buttons.

Sensi ST55 Screen Resolution

What is the screen resolution quality?

45 Sensi ST55 0 Votes Standard

13 Thermostats in this range Standard

Sensi ST55
Sensi ST55

The screen resolution is standard, providing clear visuals without excessive power consumption.

Describes the visual clarity and sharpness of the display.

Sensi ST55 Display Type

What type of display does it use?

80 Sensi ST55 0 Votes LED

30 Thermostats in this range LCD

Defines the underlying display technology.

Connectivity & Smart Features 17

Sensi ST55 Wi-Fi Band

Which Wi-Fi bands are supported?

31 Sensi ST55 0 Votes 2.4GHz

9 Thermostats in this range 2.4GHz

Sensi ST55
Sensi ST55

Wi-Fi band support includes 2.4 GHz, which is widely compatible with most routers and offers good range for home connectivity.

Specifies supported Wi-Fi frequency bands.

Sensi ST55 Firmware Update Method

How are firmware updates performed?

82 Sensi ST55 0 Votes OTA

29 Thermostats in this range OTA

Sensi ST55
Sensi ST55

Firmware updates are performed over the air (OTA), allowing users to keep the device up to date conveniently without needing physical connections.

Describes how firmware updates are applied.

Sensi ST55 IFTTT

Is IFTTT supported?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

IFTTT (If This Then That) support enables integration with a wide range of smart home applications for customized automation.

Enables automation with third-party services.

Sensi ST55 Wi-Fi Connectivity

Does the thermostat support Wi-Fi connectivity?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

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

Sensi ST55 Remote Access

Can it be accessed remotely?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Allows control from outside the home.

Sensi ST55 Bluetooth Connectivity

Does it support Bluetooth?

No 0Votes Sensi ST55

Yes Thermostats in this range

Shows whether Bluetooth connectivity is available.

Sensors & Monitoring 16

Sensi ST55 Temperature Sensor Type

What type of temperature sensor is used?

65 Sensi ST55 0 Votes Digital

13 Thermostats in this range Thermistor

Sensi ST55
Sensi ST55

Uses a digital temperature sensor, providing more precise and responsive measurements compared to analog sensors.

Defines the technology used to measure temperature.

Sensi ST55 Sensor Accuracy

How accurate are the sensors?

25 Sensi ST55 0 Votes Standard

12 Thermostats in this range Standard

Sensi ST55
Sensi ST55

The sensor accuracy is standard, offering reliable temperature readings suitable for typical residential environments.

Indicates how accurately the thermostat sensors measure conditions.

Sensi ST55 Sampling Rate

How often does the thermostat sample data?

45 Sensi ST55 0 Votes Standard

15 Thermostats in this range Standard

Sensi ST55
Sensi ST55

The sampling rate for sensor data is standard, providing dependable readings without excessive power consumption.

Describes how frequently the thermostat sensors collect and update environmental data.

Sensi ST55 Historical Data Tracking

Can it track historical data?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Historical data tracking is included, letting users review past temperature settings and system activity. This aids in optimizing HVAC usage patterns.

Stores past environmental data.

Sensi ST55 Temperature Range

What temperature range is supported?

60 Sensi ST55 0 Votes 45-90°F

29 Thermostats in this range 40-90°F

Indicates supported temperature measurement range.

Sensi ST55 Humidity Sensor

Does it measure humidity?

No 0Votes Sensi ST55

Yes Thermostats in this range

Indicates whether humidity is measured.

Scheduling & Automation 18

Sensi ST55 Daily Scheduling

Can you set daily schedules?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Daily scheduling capability allows programming different temperature settings for each day, enhancing comfort and energy management.

Allows temperature changes by day.

Sensi ST55 Vacation Mode

Is there a vacation mode?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Vacation mode helps save energy by maintaining reduced HVAC activity during extended absences. Users can set this mode to avoid unnecessary heating or cooling.

Maintains efficiency when away for long periods.

Sensi ST55 Event-Based Triggers

Are event-based triggers supported?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Event-based triggers enable automation of HVAC functions based on specific conditions or occurrences, enhancing convenience and efficiency.

Responds to events like occupancy changes.

Sensi ST55 Demand Response

Does it support demand response?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Demand response compatibility means the thermostat can participate in programs to reduce power consumption during peak demand periods.

Participates in utility demand programs.

Sensi ST55 Scheduling Capability

Does it support scheduling?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Indicates whether scheduling is supported.

Sensi ST55 Scheduling Type

What type of scheduling is available?

54 Sensi ST55 0 Votes Guided

12 Thermostats in this range Manual

Defines how schedules are created and managed.

HVAC Compatibility 18

Sensi ST55 HVAC System Type

Which HVAC system types are supported?

73 Sensi ST55 0 Votes Central, Split

33 Thermostats in this range Central, Split

Sensi ST55
Sensi ST55

Compatible with central and split-type HVAC systems, covering common residential heating and cooling setups.

Defines the general HVAC system types supported.

Sensi ST55 Heating System Compatibility

What heating systems are supported?

42 Sensi ST55 0 Votes Furnace, Boiler, Heat Pump

16 Thermostats in this range Furnace, Boiler, Heat Pump

Sensi ST55
Sensi ST55

Heating system compatibility includes furnaces, boilers, and heat pumps, accommodating a wide variety of residential heating configurations.

Indicates supported heating system types.

Sensi ST55 Multi-Stage Heating

Does it support multi-stage heating?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Multi-stage heating support allows precise control over heating systems with multiple heating stages, improving comfort and energy use.

Indicates support for multi-stage heating.

Sensi ST55 Multi-Stage Cooling

Does it support multi-stage cooling?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Multi-stage cooling capability means the thermostat can manage complex cooling systems with multiple compressor stages, improving comfort and efficiency.

Indicates support for multi-stage cooling.

Sensi ST55 Fan Control

Can it control the HVAC fan?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Fan control capability is included, allowing manual or automatic operation of the HVAC system fan for improved air circulation.

Allows independent fan operation control.

Sensi ST55 Boiler Compatibility

Is it compatible with boilers?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Boiler compatibility enables control of hydronic heating systems, a common residential heating method using hot water.

Indicates compatibility with boiler systems.

Power & Electrical 14

Sensi ST55 Power Source

What is the power source?

35 Sensi ST55 0 Votes Hardwired

11 Thermostats in this range Hardwired

Sensi ST55
Sensi ST55

The thermostat is powered via a hardwired connection, ensuring a stable power supply without relying on batteries.

Indicates how the thermostat receives power.

Sensi ST55 Battery Backup

Is there battery backup?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Battery backup ensures settings and basic operation are maintained during power interruptions, protecting comfort and system integrity.

Maintains operation during power outages.

Sensi ST55 Battery Life

How long does the battery last?

12 months 0Votes
Sensi ST55
15.26 months (Average)

Sensi ST55
Sensi ST55

The device has a battery lifespan of 12 months, providing reliable backup power when needed to maintain settings during interruptions.

Estimates how long batteries last under normal use.

Sensi ST55 Power Consumption

How much power does it consume?

1 Watt 0Votes
Sensi ST55
2.23 Watt (Average)

Sensi ST55
Sensi ST55

The thermostat consumes approximately 1 watt during active operation, indicating energy-efficient performance.

Measures power usage during operation.

Sensi ST55 Standby Power Usage

How much power is used in standby?

0.5 Watt 0Votes
Sensi ST55
0.63 Watt (Average)

Sensi ST55
Sensi ST55

Standby power usage is minimal at 0.5 watts, helping reduce overall electricity consumption when the thermostat is not actively controlling HVAC.

Indicates power draw when idle.

Sensi ST55 Input Voltage

What input voltage is required?

24 Volt 0Votes
Sensi ST55
62.79 Volt (Average)

Sensi ST55
Sensi ST55

Operates at an input voltage of 24 volts, standard for residential HVAC control systems.

Specifies required input voltage.

Safety, Compliance & Reliability 14

Sensi ST55 Electrical Safety Certification

What electrical safety certifications does it have?

75 Sensi ST55 0 Votes UL

35 Thermostats in this range UL

Sensi ST55
Sensi ST55

The thermostat meets UL electrical safety certification standards, ensuring compliance with important safety requirements.

Lists electrical safety certifications.

Sensi ST55 Regulatory Compliance

What regulatory standards does it meet?

94 Sensi ST55 0 Votes FCC

40 Thermostats in this range FCC

Sensi ST55
Sensi ST55

The device complies with FCC regulatory standards for electromagnetic interference, supporting safe and reliable operation.

Indicates compliance with regulations.

Sensi ST55 Overheat Protection

Is overheat protection included?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Overheat protection is built in to prevent damage or hazards by automatically shutting down or adjusting operations if excessive temperatures are detected.

Protects device from overheating.

Sensi ST55 Fail-Safe Mode

Does it have a fail-safe mode?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

Fail-safe mode is implemented to protect system functionality and prevent damage by defaulting to safe operating parameters if issues are detected.

Ensures safe behavior during failure.

Sensi ST55 System Alerts

Does it provide system alerts?

Yes 0Votes Sensi ST55

Yes Thermostats in this range

Sensi ST55
Sensi ST55

System alerts notify users of operational statuses or potential problems, helping maintain HVAC system health.

Notifies users of system issues.

Sensi ST55 Fire Safety Rating

Does it meet fire safety requirements?

No 0Votes Sensi ST55

Yes Thermostats in this range

Indicates fire resistance or safety design.

Surveys

Because hot takes deserve votes.

Sensi ST55 Temperature Accuracy

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

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

Sensi ST55 Response Speed to Temperature Changes

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

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

Sensi ST55 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 0Votes
Pretty straightforward — About 15 to 30 minutes 0Votes
Manageable with effort — Around 30 to 60 minutes 0Votes
Time consuming and confusing — 1 to 2 hours 0Votes
Extremely frustrating — Over 2 hours 0Votes

Sensi ST55 Ease of Daily Use

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

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

Sensi ST55 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 0Votes
Mostly reliable — Rare glitches 0Votes
Usable but basic — Limited features 0Votes
Unreliable — Frequent bugs or delays 0Votes
Barely usable — Often fails to work 0Votes

Sensi ST55 Energy Efficiency and Savings

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

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

Sensi ST55 Noise Level During Operation

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

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

Sensi ST55 Design and Display Appeal

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

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

Sensi ST55 Durability and Build Quality

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

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

Sensi ST55 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 0Votes
Pretty good price — Slightly above average 0Votes
Fair deal — Matches what you get 0Votes
Kinda pricey — Costs more than expected 0Votes
Crazy expensive — Not worth the price 0Votes

Reviews 0

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