We have a West facing oversize two-car garage plus a golf cart garage. I installed insulation on the doors from a kit (required two kits) I believe I bought at Lowe's. The insulation resulted in a noticeable reduction in garage temperature. I also keep the small window partially open as well as the propping the drop down stairs open about two inches to create an updraft which helps lower the temperature. I can't quantify how much, if any, savings resulted from this.
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