What I would worry about is humidity build up and rust on tools. I insulated my garage minimumly and stuffed a elcheepo Walmart 5000btu unit thru the wall at the 6ft level. Don't use it much but it does a nice job for its size.
The humidity right now in ar. Is horrible. I have a 20" oscillating fan upside down off the ceiling running 24/7 to protect a mini lathe, micro mill, and all the tools that go with them. If the humidity settles it going to ruin stuff even with oil coating. Last year it took a long time to remove light surface rust and too lazy to do it this year.
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