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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 Wi-Fi Programmable Thermostat works on most combined heating and cooling systems without a c-wire.

The Sensi Wi-Fi Thermostat also works on most combined heating and cooling systems without a c-wire, however, will require a c-wire for Apple HomeKit functionality.

The Sensi Touch Wi-Fi Thermostat always requires a c-wire.

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

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