It seems like common sense. If you aren’t using the guest room, why pay to heat or cool it? You reach up, slide the little lever on the vent, and feel satisfied that you are saving money on your energy bill. It is the same logic as turning off a light switch.
However, HVAC professionals warn that your heating and cooling system does not work like a light bulb. Closing vents is actually one of the worst things you can do for your system’s health and your wallet. It creates pressure imbalances that can lead to expensive repairs and, ironically, higher energy bills. Here is why you need to open those vents immediately.
