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We live in a tiny old cottage with no insulation in cold territory. The entrance ways to the dinette and bedroom/bathroom sections of the house are without doors. We hang 2 or 3 layers of blankets in these doorways during the winter and only heat and use the primary use room, the living room. Our heating bill is still a little high, but not heating the extended sections of the house saves us about 2/3 of what we'd pay otherwise.
In summer, the blankets remain in the entrance way to the bedroom and the air conditioning cools the rest of the house. Next year, if it's a hot one, I'll add blankets to the kitchen entrance way as well.
Source: Necessity, and talking with husband and a friend; sort of a brainstorm session.
By Nekocat from Oregon
Illinois winter blew in extra-early this year and I did not have the money to buy a much-needed storm door for the back door which leads down to the basement. The thin wooden door has nine windows and two panels on the bottom. I cut cardboard to fit the windows and have sealed around the edges with hot glue which can be removed in the Spring, instead of using caulk.