Sounds like one of those portable oil filled radiators would be perfect for you. They’re very safe and pretty efficient. You just gotta give them a little time to get ahead of the curve!

Is your shop insulated? That’s another huge issue. 

We don’t have cold here like that, so I’ve just got a little IR heater hanging from the ceiling facing the bench. The IR is great because it actually heats the solid items in the shop, not just the air. Very helpful…to get it up above 52, ‘cause that’s about as cold as it ever gets in there! Seriously, the insulation really helps with that…even if it is only Cali winter weather. 

Ryan/// ~sigh~ I blew up another bowl. Moke told me "I made the inside bigger than the outside".