8
Step 1. Power off your HVAC system
Before doing anything else, power off your system. If your
HVAC equipment doesn’t have a master switch, go to your
circuit breaker box and turn off the breaker.
Verify that the equipment is off by attempting to
adjust the temperature at your existing thermostat. The
thermostat will show the temperature change but your
cooling or heating should not come on.
Power off your system either
using the master switch or at
the circuit breaker box.
