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.
Insulating attached garage roof.
I wrote a big article discussing whether you should insulate your garage.
Don t insulate your garage walls and ceiling without insulating the big garage door too.
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 an attached garage has some special considerations that you must address differently then a unattached garage.
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 you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.
However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof.
If your garage is attached to your house you will notice a big difference in your home s temperature as well.
The regulating temperature has positive effects on your cooling and heating costs.
Be sure to count the spaces above doors and windows.
Regulate your garage s temperature all year by installing insulation.