One of the best methods you can use if you want to regulate the temperature of your garage is to insulate the garage roof.
Insulating attached garage roof.
However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof.
I wrote a big article discussing whether you should insulate your garage.
Keep in mind that the structural metal ribbing of garage doors is an excellent conductor of heat and this typically doesn t get insulated.
If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.
The most important issue is that attached garages must have a system in place to keep carbon monoxide co from a running vehicle inside the garage from filtering through the walls and ceiling into the house.
You can buy insulation kits for standard metal garage doors or you can cut pieces of rigid foam insulation to fit each door panel section.
Regulate your garage s temperature all year by installing insulation.
Adding insulation won t make your garage a perfect temperature by itself but it will take the edge off the freezing winters and the sweltering summers.
If your garage is attached to your house you will notice a big difference in your home s temperature as well.
Insulating an attached garage has some special considerations that you must address differently then a unattached garage.
Don t insulate your garage walls and ceiling without insulating the big garage door too.