Insulation on garage door

My entire garage is insulated. It stays very cool all the time until the temps reach into the 90's and even then the temps still range in the 70's. And it stays much warmer in the winter--even in temperatures in the 30 below range--usually around zero degrees in that bitter cold.

Yes it does help, but you really need to insulate the entire garage for it to be effective. Worth the upfront cost, as your heating bills in winter and cooling costs in summer will be much less - every month. Another thing to consider are attic fans. I had some installed when I replaced the roof. Amazing! And another thing that helps with your heating and cooling costs. The last thing to consider are your windows, if not new, think about upgrading when you can. Windows and doors are the number one cause for heat and a/c loss. I am doing my house one side at a time, will take 3-4 years to complete.

I dobt think it does. We have it in our garage and the previous owners added some to the door but I don’t notice a big difference.

It will help keep the garage warmer or cooler depending the season. Won't affect the rest of the house. Bedroom floor above the garage has to be sealed and insulated by building codes when the house was built. There can't be any air movement between an attached garage and main living space for safety sake.

Yes, insulated garage doors are worth the money, but as noted above- the whole garage ceiling has to be insulated.

If your garage ceiling is already drywalled, I’d install 2 layers of sheet foam insulation with the seams taped and staggered. That’ll get you at least a R-11, maybe higher depending on what you buy.

https://www.hometalk.com/diy/repair/windows/diy-insulated-garage-door-2999552