Q: I’m not sure whether to get the Smart or Smart Si product. Is there a feature comparison between the two?
A: There sure is! All the major differences and similarities are posted in the chart below.
Feature Smart Thermostat Smart Si Thermostat
| Mobile Apps | iPhone/iPod Touch Android | iPhone/iPod Touch Android |
| Compatible Accessories | Remote Sensor Module Power Supply Smart Plugs |
Smart Plugs |
| Conventional Heating & Cooling | 3H / 2C | 2H / 2C |
| Heat Pump Heating & Cooling | 4H / 2C | 3H / 2C |
| Number of Wires to Thermostat | 4 | Heat Only - Min. 3 Cool Only - Min. 4 Heat/Cool - Min. 5 |
| Dry Contact Inputs | 2 | ... |
| Dual-Fuel | Y | Y |
| Auxiliary heat | Y | Y |
| Humidifier / Dehumidifier control | Y | N |
| Wireless Protocol | B / G | B / G / N |
| Optional 2.4GHz ZigBee® Module | Y | Y |
| No Annual Fee | Y | Y |
| Alerts | Sent by Email & Web Portal Can be sent to multiple emails Can be sent to contractor |
Sent by Email & Web Portal Can be sent to multiple emails Can be sent to contractor |