C Wire Compatibility
Some Sensi models require a “C” wire for operation. Other Sensi models may only require a “C” wire if it is controlling a specific type of HVAC system.
- Sensi Lite and Sensi smart thermostats: Only requires a “C” wire with the following HVAC systems: heat pumps, heat-only systems, and cool-only systems.
- Sensi Touch and Touch 2 smart thermostats: Requires a “C” wire for all applications.
| System Type | Sensi Lite smart thermostat | Sensi smart thermostat | Sensi Touch smart thermostat | Sensi Touch 2 smart thermostat |
|---|---|---|---|---|
 |  |  |  | |
Conventional Heating and Cooling | Yes1 | Yes2 | Yes3 | Yes3 |
Heat Only | Yes3 | Yes3 | Yes3 | Yes3 |
Cool Only | Yes3 | Yes3 | Yes3 | Yes3 |
Heat Pump/Geothermal | Yes1,3 | Yes3 | Yes3 | Yes3 |
Whole Home Humidifiers / Dehumidifiers | No | Yes | Yes | Yes |
Communicating/Proprietary System | No | No | No | No |
Line Voltage | No | No | No | No |
Millivolt | No | No | No | No |
RV/Camper 12VDC Applications | No | No | No | No |
1 Compatible with multi-stage systems up to 1H/2C or 2H/1C |