I think its do-able, but with certain precautions.
One being good air circulation. Nobody likes lying in a stinky, stuffy, hot spot.
And I'm sure rats don't either. Plus it helps prevent RI.
You can freeze waterbottles or the big liter soda bottles and put them in enclosures to keep the rats cool. I do this with my ferrets since they never do well in any sort of heat.
But If you have spare funds, I would invest it a small single AC window unit to put in the garage. ( personally, I think this is the best option. And I bet you wouldn't like to walk into a hot stuffy garage either.)
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