I have a north-facing garage. It would get extremely hot in the summertime when the sun is on that side instead of the south side. I put insulation in the garage door itself. Helped a little bit. But what really did the trick is I got the Solar Guys to put in a garage/attic fan. They put a vent in each lower corner of the garage door (properly screened to prevent bugs/insects from getting in) so the fan pulls the air from the vents through the garage and the air is pushed out thru the attic vents already in the roof. The fan also has an adjustable thermostat so you could keep the garage at 80 degrees or 85 degrees, whatever you desire. It has been very beneficial in not only reducing energy cost (I have a refrigerator in the garage) but all the stuff you keep in the garage or the attic will not rot anywhere near as quick as it would by having a hot garage with no airflow. Hope this helps.
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