HVAC system and closing vents for extended periods of time?

Question

I've heard that it's bad to close off vents for extended periods of time ... that an HVAC system is meant to handle the SQ footage that it was installed for and that shutting off vents can cause harm to the system. Is this true? I may be moving into a large house that has way more rooms than I will use and want to conserve power by shutting off the vents and closing the doors to rooms I will not use. What say you HVAC experts?

Answer 1

Many homes are designed with register vents that open and close. When a home air comfort control system is designed there is enough pressure to control the whole home. That includes all living space. I've seen comfort control in many garages as well.
It's designed for the homes comfort as well as your own. As I said there is enough air to comfort the whole home. In addition to that I would like to add that it’s designed to run all room's at all times.
If your looking to save money over years and control the rooms you want comfort in, you really need a different thermostat, you need a zone control, and duct dampers to control the amount of air properly that is if your looking to save money in the long run, meaning over years on your electric bill, and if you want to control the rooms you want comfort in.
Most home's don't have this feature unless it's at the customer's request (for a home comfort zone control system) at the time that the home was built, that is because; of course this would cost more, and most people go cheap to start out not looking at all the possibilities on long term money saving. This all depends on the customer, and how much money they have to spend at the time the home was built.
So the answer is no, you may cost youself more money in the long by shutting the air off, that is because the system would run the same and have problems releasing all of the air. this is called restricting the output. which may cause it to freeze up, or kick out on overload.

Answer 2

Not having a HVAC system, I cannot tell you the facts regarding the capacity of the system to heat or air condition a house.. If the system is large enough to service all the rooms, it is logical to conclude if rooms are shut off by closing vents the system will have less area to cool and therefore will be under less strain resulting in using less power thereby reducing cost. Too many systems donot have the capacity for the area which has to be heated or cooled.

Answer 3

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