I have one room that is always cooler in the winter than the rest of the house. Unfortunately, it is my office and I spend a lot of time in there! When I had my furnace serviced, I mentioned it to the plumber. He said it was the last register on the line and it was hard for the fan to push air to it.
One way to improve the situation was to tape the seams of the ducts with silver tape. It will withstand heat and cold. My husband taped all the seams last year. I noticed some of the old tape showing through. I think I will add another strip of tape to each seam to make sure no air is escaping from under the old white tape. I am lucky since my ducts are easy to get to in our unfinished basement.
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