Sensi™ smart thermostat

Sensi

Sensi™ smart thermostat

ST55, The highly-rated Sensi smart thermostat is loaded with features designed to make it easier and more convenient than ever to achieve the perfect level of home comfort. From a simple installation process to an intuitive mobile app that allows you to adjust the settings on your thermostat for complete control - Anytime. Anywhere.

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ST55
ST55, Sensi™ smart thermostat
Certifications
Energy Star
System Type
Universal - Single-Stage, Multi-Stage or Heat Pump
Overall Dimensions
5.58W X 3.75H X 1.00D
Power Source
Hardwire
Battery
Style
Horizontal
Certifications
System Type
Overall Dimensions
Power Source
Style
Energy Star
Universal - Single-Stage, Multi-Stage or Heat Pump
5.58W X 3.75H X 1.00D
Hardwire
Battery
Horizontal
Available
$129.00
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Features

  • Save About 23% On HVAC Energy*: By adjusting the temperature using flexible scheduling, remote access, and geofencing, Sensi thermostat customers save about 23% on HVAC energy usage.
  • Extensive compatibility**: Works with HVAC equipment found in most homes. Common wire (c-wire) not required for most applications.*** Check compatibility at sensi.emerson.com/compatibility.
  • Most install in 30 minutes or less****: Use the built-in level and step-by-step app instructions for a quick installation. Skip any extra work painting or patching the wall thanks to the standard thermostat size.
  • Circulating fan: Helps maximize comfort and balance temperature throughout your home by increasing air circulation.
  • Smart home compatible: Works with Amazon Alexa, Google Assistant, Apple HomeKit (c-wire required), and Samsung SmartThings smart home platforms.
  • Humidity control: Stay comfortable with humidification/dehumidification control.
  • Keypad lockout: Maintain total control by disabling changes made by others at the thermostat
  • Temperature limits: Prevent others from adjusting temperatures too high or too low.
  • Flexible scheduling: Program a schedule for each day of the week.
  • Monitor HVAC system: Get smart alerts to help detect extreme temperatures & humidity levels or loss of heating/cooling.
  • Get reminders: Receive notifications for filter, UV lights, humidifier pad, and HVAC maintenance.
  • View usage: Monitor current day and historical heating, cooling and fan runtimes right in the app.

Documents & Drawings

Specifications

Terminal Load Rating
1.5A per terminal, 2.5A maximum all terminals combined
Heat Differential (Conventional or Aux/Gas/Oil/Elec)
Fast 0.5°F, Med. 0.75°F, Slow 1.9°F
Cool Differential (Central Air or Heat Pump)
Fast 0.9°F, Med. 1.2°F, Slow 1.7°F
Humidity Range
90% non-condensing maximum
Temperature Range (Shipping)
-40 to 150°F (-40 to 66°C) Shipping
1
Product image shown are for illustration purposes only and may not be an exact representation of the product or package contents
*
Energy savings calculated by comparing operation time for a nationwide sample of Sensi users with temperature adjustments averaging 4° vs. users with no adjustments. Savings vary based on equipment type/condition, insulation, climate & temperature adjustment size/frequency.
**
Does not work with electric baseboard heat and some other systems. Refer to our online compatibility resources to check if Sensi will work in your home.
***
Based on survey results of 2,120 respondents that purchased and installed a Sensi thermostat in 2018, approximately 70% reported installing in 30 minutes or less. Adding a common wire may impact installation time.
All system types require a common wire (c-wire).