I am going to install some NEST thermostats. The directions say that I should turn the system off by turning off the power to it. However, I'm worried that an abrupt power cut will be damaging. Do I just shut off power to it, or do I need to do some sort of "soft" shutdown procedure to bring it down and back up?
What labels should I look for in the circuit breaker panel to turn the unit off? I see water heater and the like, but didn't see a label for "central heat".