I use half of my two car garage as a garage and the other half as a gym. I am lucky enough that when the house was built they routed AC ducts to the garage but since the thermostat is inside (and I am thankful for that) it can still get pretty warm in the summertime (Texas).
To help it stay cooler I was thinking about adding an insulation kit to my garage doors, but I was unsure if it would actually be effective. The walls all have panels up so I can't tell for sure if there is insulation in them but from the looks of it, it was being used as a room in the past as carpet had been laid down at some point so I assume it would be insulated.
One other note, the garage door doesn't see a direct sun hit. The doors are closer to lining up north to south than east to west.
Does putting insulation on a garage door make a noticeable difference in maintaining cooler temperatures in the summer or are they still too leaky?
Best Answer
Yes, insulation would help reduce heat transfer through the door enough to make it a worthwhile investment. Steel is a good heat conductor, so heat from the outside air is readily transmitted to the indoor air.
You wouldn't have to purchase a branded kit, however. Simply fitting 1" or 1-1/2" extruded foam (or even Styrofoam) will do. The one you linked seems priced competitively, though.
Make sure that you have good vinyl seals on the door as well. Airflow is much worse an energy waste than conduction.