Most won't spend the extra money, but I'm installing a mini-split. My garage faces the west so it gets a lot of sun in the afternoon. Even with insulation, it hits 88-92F in the summer. With the mini-split, I'll be able to air condition it in the summer and heat it in the winter for the times I'm working in the garage. It costs about $900 for the non-DYI kits and about $1300-1500 for the DYI kits for the size I need (525 sq ft), which is 18K BTU. I did a garage makeover this year and this is the last thing on the list. I'll do some testing in the winter, but I think I'll keep my garage at around 50F so that the Teslas don't have to precondition itself before charging the battery. My garage is typically 8-10F warmer than the ambient temps in the winter, so it's usually around 40-42F in the winter time. At around 50F, it won't be as freezing cold to do the rinseless washes.
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