Thermostat Installation Cost in Southern California (2026)

$185 to $695 installed depending on the thermostat. A smart thermostat with the unit included runs $345 to $525, and labor alone on a customer-supplied unit is $145 to $225.

Most smart thermostats need a common wire for steady power. If your existing bundle doesn't have one, we either add a C-wire adapter at the air handler or run new thermostat cable — $145 to $285.

On a simple single-stage system with an existing C-wire, often yes. Heat pumps, two-stage and communicating systems miswire easily, and a reversed O/B terminal on a heat pump will run heat when you call for cooling.

In the Antelope Valley, scheduling around SCE time-of-use peak hours typically saves 8 to 15 percent on cooling. The savings come from the schedule and setbacks, not from the brand.

We match the control to the equipment staging. Single-stage takes almost anything, two-stage needs Y2/W2 terminals, and modulating inverter systems generally require the manufacturer's communicating control to keep full capacity modulation.

45 to 90 minutes including configuration, Wi-Fi setup, and a full heating and cooling cycle test to confirm correct staging.