Ecobee 4

Room sensors: they measure temperature and occupancy allowing you to achieve the comfort settings you want in the rooms that matter most. One room sensor included, 2-packs sold separately
Save money: ecobee uses Advance sensing, external weather data, and learns your HVAC system to save you up to 23% on your heating and cooling bills* compared to a hold of 72 degrees
Great compatibility & reliability: Ecobee4 works with the vast majority of residential HVAC systems. Check your compatibility by using the compatibility checker on the ecobee Website. 3yr warranty provided
Easy install: installation takes approximately 30 min and we provide in-app Guided videos to make it easy. No c-wireno problem – use the power extender kit included in the box
Works with your smarthome ecosystem: Amazon Alexa, Google assistant, Apple homekit, microsoft cortana, Samsung SmartThings, wink, IFTTT – Ecobee4 works with them all
Alexa built-in with speakers and microphones: its like having an Amazon echo dot built right into your thermostat!* some Alexa functionality not supported – see Alexa section below

From the manufacturer


Comes with built-in Amazon Alexa Voice Service With 10,000 skills and counting, ask ecobee4 to adjust the temperature, read the news, tell you a joke, and more - even from across the room.	Provides all-around comfort Comes with a room sensor to help manage hot or cold spots in your home. Additional room sensors sold separately.

Model	ecobee4	ecobee3 Lite
Voice	Built-in Alexa Voice Service and far-field voice technology	No built-in voice service.
Sensors	Room sensor compatible. Comes with one free.	Room sensor compatible. Sold separately.
Display Size	3.5" Touchscreen	3.5" Touchscreen
Compatibility	Conventional (2H/2C), Heat pump (4H/2C) incl. 2-stage auxiliary heat, Gas, oil, electric, Dual fuel support	Conventional (2H/2C), Heat pump (4H/2C) incl. 2-stage auxiliary heat, Gas, oil, electric, Dual fuel support
Accessory support	Humidifier, Dehumidifier, Ventilator, HRV or ERV	No accessory support
Savings *Compared to a hold of 72F	Up to 23% annually on heating and cooling*	Up to 23% annually on heating and cooling*
Reliability	Hardwired for reliable power	Hardwired for reliable power
Smart	Uses room sensors, local weather and your schedule to deliver cost savings and comfort.	Uses room sensors, local weather and your schedule to deliver cost savings and comfort.
Warranty	3-year customer install warranty	3-year customer install warranty