I paint in a 10x8 Shed and just use a small fan heater to warm it when needed.
I normally put the heater on
Make coffeee have a smoke
back to a warmer shed
prep the shell etc, by which time the shed is sufficiently warm to paint.
I do tend to leave the heating on for a n hour or so after I have finished painting
I also keep my paints in the house (protection from frost)
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