Mine is my garage, so no heat or air. I do have few large propane space heaters for when I need to get something done. Last year there was a few times it go down to -22F a few times. So thats a no go for garage time.
Next year the garage door gets replaced with a VERY good one so there will be some improvement. Would love to have a dedicated shop one day but that’s a far off dream right now.
If you dont like what you can buy, build it.