Will increase air flow but won’t help with the temperature just brings in hot air.

Thanks all for the information. I’m going to insulate the doors first and eventually install the screens.

Yes we did both and it really helped.Wish we did earlier

Just did the insulation on the interior of the doors with a product purchased on line. No adhesive and did it myself in about 2 hours. Did lower the temperature enough to make it much more comfortable. Opening the window does pretty much nothing. Many of the other solutions, like poking holes in the door, attic fan, etc do seem worth it to me. If you use the garage as a work area, pony up the money and get a split for the most comfort.

Keep in mind that if you put up a radiant barrier in your attic, it will likely kill your cell phone reception. Not much of an issue if you use WiFi inside your home. But...if you lose power, or otherwise lose your WiFi signal, your cell phone probably won't work inside the house.

For those that added the automatic roll down screen garage doors, who did installation or did you contract?

The Solar Guys put a exhaust fan in our garage ceiling and vented our garage doors; it’s big enough that it pushes the hot air out of the attic through the eaves and the existing vents in the roof.

I have a black south facing garage door and it also measured 145 degrees (!) I don't have numbers after insulating....but it's much cooler. Still gets hot as hell in the garage though but not quite as hot.

Joe

we added barrier on garage doors as well as more insulation in attic. WE have have trees which help so much. I let cool air in the garage in the morning and keep the doors shut during the day. It is much cooler, but then we have trees.

As far as the builder not putting in the insulation ...they save money not you.

I cry each time someone cuts down an oak tree that provides much needed shade for a home to use less electricity and stay way cooler. While some people were taking them out I was planting more. I will rake up no problem to save on my use of power.

My advise yes insulate. BTW my garage faces harsh west sun

Air temperature yes but where the door insulation helps is the heat that the sun radiates on the doors. I did mine with Owen Cornings glass along with the attic fan and it made a difference right away and also made it more quiet in the garage. I would do it again if I were to move to another home.

Our garage faces West so first we added insulation to the door.
Then we had a fan installed ( not solar ) and then added some
insulation. All of this made it much better.

The fan was fine during Hurricane Irma.

Cell phone reception
 

Nope. Not so.

RK Sunshades - Rick is the best!

Interesting. I was led to believe that a garage ceiling cannot have an opening or ductwork that vents directly into the attic. Does yours have a fire-rated door on it?

That is so wrong. Not even worth explaining. If you keep your house at 76 there is no way in hell that the garage is going to be 84