Our garage doors face east getting the morning sun. Without insulation the door transfer significant heat into the garage. I bought styrofoam panels at Lowes. These panels are the correct thickness to fit against the door but inside the support structure holding the door together. You will need to cut the length of the each panel to fit, but no glue is needed. It took me about a half of a day to do a golf cart door and double car garage door. I think I bought 5 packages of the large panels. It is absolutely amazing how much the heat transfer is reduced.
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