Since the thermostat controls the heating and cooling systems in your house, neither would be able to function. In other words, you wouldn't be able to get central heating or central air in your house.
Most mechanical thermostats do not need power to operate. They are based on the change in shape of a metal strip to open and close a switch. You still need power for pumps etc.
The furnace or air handling unit in the house.
I have a programable thermostat but do not know how to regulate it.
have you changed the battery in the thermostat?
Under the cap In the thermostat house on the left side of the engine.
This question is a little vague, but I'll make by best attempt. I am assuming you mean a whole-house HVAC unit, and that you are concerned with a possible power surge so you want to shut the unit off at the thermostat. If this is correct, you need to know that the thermostat doesn't control the HVAC unit the way a switch controls a light fixture. As long as your HVAC breaker is on, you will have AC power at the HVAC unit. This usually includes at least a condenser unit outside and a blower either outside or inside. All the thermostat does is tell the HVAC components when to use the power applied and when to do nothing. The power does not flow through the thermostat to the HVAC like power through a switch to a light. Think of it this way: 'Off' on the thermostat doesn't mean power off. It means 'power available, but unit not running'. So, if you want to protect your HVAC from the potential of a power surge you will have to shut off the circuit breaker(s) feeding the HVAC components, not the thermostat.
homeostasis
It will be in the thermostat housing where the radiator house connects to your motor.
My thermostat has to at 90 degrees to get the house at 65.
your body is like a thermostat because you sweat to cool of and shiver to get warm. With a thermostat if it's cold the thermostat warms your house. When it's warm outside the thermostat cools your house. Thats why your body and a thermostat is a like.
Turn it on with thermostat
Digital display thermostat battery(s) need replacing
The thermostat tries to control the heating and cooling in you home to maintain a comfortable or energy efficient temperature.