Our mid century house has all single pane windows, so we needed a way to keep the heat in and cold out without replacing them as they are built in. Indow inserts were a great solution for us. So far, we've had them put in our bedroom, bathroom and closet. They inserts raised the temperature in our bedroom by almost 10 degrees. We are planning to do the remainder of the house now that we know how well they work.
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