The Garage is boiling hot and guess what its connected to?! Insulating your house tries to minimize the heat exchange, as an example, if it was 120 degrees out and you were cooling your house to 60 degrees no matter what R-Value you have your home will need energy to maintain that 60 degrees. On the other hand, if it is 60 degrees out it will take no energy to maintain the 60 degrees, internal temp. The hotter it is outside, the more energy it takes to keep inside cool. I found this out a couple of summers ago when I was lying in the bedroom, and I couldn't get the room to cool. I took my handy-dandy infrared temp and started poking around to see where I was losing the most cool air, or gaining the most hot air! Let me back up a minute here ... I moved into this home in about 2012, there were aluminum single pane windows, and my assumption was that was the reason the house was so darn hot. Thus, I went to work. I replaced all the windows with new efficient windows (YES DIY!) ...
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