ecobeelogo ecobeelogo ic_roomsensor_tstat_CA22 A9D321DF-71AF-4F89-8E7C-9AD74BC9025872

ecobee3 vs. Smart Si
Features Comparison

Feature
ecobee3: ecobee3
Smart Si: Smart Si
Smart: Smart
Estimated energy savings
ecobee3: 23%*
Smart Si: 23%*
Smart: 23%*
Remote sensors
ecobee3:
Smart Si: -
Smart: -
Display size (inches)
ecobee3: 3.5
Smart Si: 2.5
Smart: 3.5
Touchscreen
ecobee3:
Smart Si: -
Smart:
Thermostat proximity sensor
ecobee3:
Smart Si: -
Smart: -
Accessory control
ecobee3: H or D or V
Smart Si: -
Smart: H, D and V
Smart Home/Away
ecobee3:
Smart Si: -
Smart: -
Follow Me
ecobee3:
Smart Si: -
Smart: -
Built-in level
ecobee3:
Smart Si: -
Smart: -
User accounts
ecobee3: Shared
Smart Si: Shared
Smart: Shared
Thermostat management
ecobee3: Up to 20
Smart Si: Up to 20
Smart: Up to 20
Power options
ecobee3: Wired
Smart Si: Wired
Smart: Wired
Local weather forecast
ecobee3: 5 days
Smart Si: 5 days
Smart: 5 days
Warranty (years)
ecobee3: 3
Smart Si: 3
Smart: 3
Onscreen alerts & reminders
ecobee3:
Smart Si:
Smart:
Free cooling
ecobee3: ✔ (with ventilator)
Smart Si: -
Smart: -
Optimal humidity
ecobee3:
Smart Si:
Smart:
Historical system information
ecobee3: 15 months
Smart Si: 15 months
Smart: 15 months
Fan dissipation
ecobee3:
Smart Si:
Smart:
AC overcool to dehumidify
ecobee3:
Smart Si:
Smart:
Mobile apps
ecobee3:
Smart Si:
Smart:
Wi-Fi
ecobee3:
Smart Si:
Smart:
Home IQ™
ecobee3:
Smart Si:
Smart:
Web portal
ecobee3:
Smart Si:
Smart:
Programmable fan
ecobee3:
Smart Si: ✔ (with c-wire)
Smart:
Humidity sensor
ecobee3:
Smart Si:
Smart:
Keypad lock
ecobee3:
Smart Si:
Smart:
No annual fees
ecobee3:
Smart Si:
Smart:
Onscreen contractor info
ecobee3:
Smart Si:
Smart:
Open API
ecobee3:
Smart Si:
Smart:
Remote sensor module
ecobee3: -
Smart Si: -
Smart:
Dry contact inputs
ecobee3: -
Smart Si: -
Smart:
*These savings are calculated by comparing to a hold of 22˚C. For details visit ecobee.com/savings