I've taped over all the vents downstairs before. All the bedrooms are upstairs, so at night i was only heating half the house where people could appreciate the heat. It did create more pressure in the rooms where the vents where open, so i used a book to crack the door open to help the heat move through the room.
The only problem was the thermostat was downstairs in the cold. I set it to 50 degrees so the upstairs wasn't too hot.
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I try to be helpful. I'm not an expert.
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