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.

Available as recurring order
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Features

  • Installs and operates like a standard thermostat when not connected to Wi-Fi|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.
  • App changes color to show if the system is heating or cooling|Most Install In 30 Minutes or Less**: Use the built-in level, illuminated easy-click terminals 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.
  • Compatible with Apple HomeKit, Amazon Echo and Wink|Extensive Compatibility***: Works with HVAC equipment found in most homes. Check compatibility at s sensi.emerson.com/compatibility
  • Geofencing option and smart alerts|Smart Home Compatible: Compatible with smart home platforms Amazon Alexa, the Google Assistant, Apple HomeKit and SmartThings.
  • Built-in dual fuel heat pump option|View Usage: Monitor current day and historical heating, cooling and fan runtimes right in the app.
  • Energy Star certified: check out rebates available through your local utility company (utility rebate finder)|Monitor HVAC System: Get smart alerts to help detect extreme temperatures and humidity levels or loss of heating/cooling.
  • Get Reminders: Receive notifications for filter, UV lights, humidifier pad, and HVAC maintenance.
  • Keypad Lockout: Maintain total control by disabling changes made at the thermostat.
  • Temperature Limits: Prevent others from adjusting temperatures too high or too low.
  • Circulating Fan: Air circulation may improve indoor air quality by helping to regulate temperature and prevent buildup of particles and mold.
  • Humidity Control: Stay comfortable with humidification/dehumidification control.
  • Energy Star Certified: check out rebates available through your local utility company (utility rebate finder)

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
Heat Pump Dual Fuel Control
Yes (Remote Sensor Not Required)
Heat Pump Auxiliary Lockout Control - Outdoor Sensor Option
None
Remote Sensor Options
None
Auto Changeover (Heat/Cool)
Yes
Fan Option
Auto, On
Filter Change Reminder
Yes
Early Start
Yes
Keypad Lockout
Total Lockout
Set-Point Temperature Limits
Yes
Backlight
Yes; Continuous Backlight with Common Wire
Voltage
20-30 Vac, NEC Class II, 50/60Hz
Amp Rating
0.05 to 1.5 Amps (load per terminal) 1.5 Amps maximum load (all terminals combined)
Rated Differential, Universal
Heat (Conventional Gas, Oil, Electric): 0.5°F (Fast) 0.75°F (Med) 1.9°F (Slow); Cool (Central Air): 0.9°F (Fast) 1.2°F (Med) 1.7°F (Slow); Heat Pump: 0.9°F (Fast) 1.2°F (Med) 1.7°F (Slow); Aux. Heat: 0.5°F (Fast) .
Ambient Operating Temperature
32° to 105°F (0 to 40°C)
Operating Humidity
90% non-condensing maximum

Documents & Drawings

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).