Installation

Does my Sensi thermostat need a common wire, or "c-wire"?


The need for a common wire, or “c-wire,” depends on which Sensi thermostat model you have and your system type.

The Sensi smart and Sensi Lite smart thermostats work on most conventional heating and cooling systems without a c-wire. However, you will need a c-wire for:

  • heat only systems
  • cool only systems
  • heat pump systems

Apple HomeKit Compatibility

The Sensi Touch smart and Touch 2 thermostat always require a c-wire.

Reference the master compatibility chart in this article to review c-wire needs.


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