Quote:
Originally Posted by GpaVader
I have done this in my 2 car w/golf car garage, 3.5 years ago. I had a mini-split installed. As Villagethinker suggested, I did insulate the garage door, as I have an East facing door, that made a huge difference. I also had the garage door windows tinted. I elected not insulate the ceiling because it was already set up for storage and I was not sure I would gain as much since heat rises and want to let that out. I shopped around on the mini-split and opted to go with Munns, the did my houses HVAC and they had the best value.
I did this because my garage is also a workshop for both my model building, where I have a small spray booth and also for my 10 needle embroidery machine and 3D printing. Adding this added about $15-20/month to my electric bill in the summer months. I typically have the space set for 74* and it recovers nicely when the door is opened for a long period of time. My main purpose for this is reducing humidity in addition to making it more comfortable.
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Yes, heat rises, but an uninsulated attic that is easily 120° much of the year separated from the garage by half an inch of drywall with an R value of less than one radiates a LOT of heat, like a hot oven does or a hot car. If you don’t need to insulate an attic over an air-conditioned garage because heat rises, then why does the rest of your house have insulation in the attic? In your garage, the cooled air comes into contact with the hot drywall and is heated up.