Can you tell me who you used?

Insulation in garage attic and on the garage doors will barely be a noticeable difference no matter what anyone on here tells you to the contrary. Changing the garage door to a factory insulated one of high quality will be noticeable. Power ventilation in garage attic that isn't running on a solar panel will be noticeable.

Definitely worth it to me
 

I insulated the garage doors and noticed it was not nearly as hot as before. The sun shines on our garage door all day and it would just radiate heat into the garage. Afterwards, it's probably 5-10 degrees cooler. Then we added R38 insulation over the garage and noticed at least as big a difference as the garage door did. Finally, I do a lot out in the garage so we added a Mitsubishi split unit. We now keep the garage at 78 degrees for just a few dollars extra electricity a month. That's our experience and would do it all again as we're very happy with the results.

Jim

Oh those worthless gauges I have in my garage and in my garage attic.

:popcorn:

The problem with power ventilation in the garage is it's pulling the hot outside air into the garage so if the temperature is 95 in the afternoon, the ventilation will be pulling 95 degree air into the garage and up to the attic. I've seen several of these systems and they don't make much difference.

As far as solar attic fans, I've had both electric and solar. Today, the newer solar attic fans have a way higher rpm and can move a lot of air. Not as much as an electric unit but good enough. I had two high capacity solar fans installed and it was too much ventilation. I could hear the fans going when it was quiet. I changed one of the high capacity fans in the back of my house to one that was the next level down and that did the trick. My attic never gets more than 10 degrees hotter than the outside air and never super heats with these fans installed and I don't hear them running and that's all that matters.

Sorry, we did it during construction of our house...........it was a Village's sub.

Foil Backed Insulation installed to roof - major difference
 

We had a contractor install foil-backed insulation to the Garage Roof and doors and according to other contractors who did work in our garage after it was done - they commented that our garage attic was a lot cooler than any other garage they were in. So based on these unsolicited comments from the contractors who went into our garage attic after the insulation was installed, I would say it worked and I would highly recommend this type of insulation instead of batt insulation in the floor.

Foil Backed Insulation installed to roof - major difference
 

We had a contractor install foil-backed insulation to the Garage Roof and doors and according to other contractors who did work in our garage after it was done - they commented that our garage attic was a lot cooler than any other garage they were in. So based on these unsolicited comments from the contractors who went into our garage attic after the insulation was installed, I would say it worked and I would highly recommend this type of insulation instead of batt insulation in the floor.