Quote:
Originally Posted by retiredguy123
If you install an AC unit, you should definitely insulate the garage door and the ceiling above the garage. If you don't install an AC unit, insulating the garage door or the ceiling will not help much, if any, to cool it down. There is no way that your garage will be 20 degrees cooler with just garage door insulation. Insulation only slows down heat transfer, it doesn't prevent it, unless you are conditioning the space with an air conditioner. That is why the builder doesn't insulate unconditioned spaces in the first place.
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I had the garage ceiling insulated and installed a radiant heat barrier when I insulated the door it helped but not 20 degrees. The house I live in now the former owner went further with insulating the entire garage and installing a split unit can now get what ever temperature you want but fairly comfortable without even turning on the split unit.