After screwing up a paint job last winter because of the cold, I resigned myself to painting ONLY when it was 60 or higher. Makeup air is cold. It cools metal off FAST. Leads to irregular curing, IMO, and results in orangepeel.
Or , see if you can rent a booth.
I made such a mess of my shop, it made me sick. I masked everything off, wet the floors, you name it. I shot red and white single stage. Guess what color my floors were? And my tool boxes, and the walls behind the mask. That crud gets EVERYWHERE.
One word to the wise. If you insist on using your shop, buy some sprayable paint mask, like they use in booths. Spray the floor. When you are done, it peels right up.