One last suggestion is to check how well the windows and doors are sealed in the house. If you can slip a piece of paper through a closed door or window and slide it out without tearing it, then you’re most definitely leaking heat. Sealing the windows with tape and plastic is a nice idea, but tape is not inherently air-proof unless you get some serious industrial stuff, and if you use that type of tape it’ll tear the paint off the walls when you finally remove it.
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