Up until last year, I didn't bother about the cold in the workshop. I would just layer up and occasionally wear a heated gillet. Last year I got ill, had an operation and six months of brutal chemo (just had my second all-clear). This made me ill if the temperature went below 10C. So, I bought the Hcalory portable diesel heater. Originally I set it up outside so it only blew heated fresh air into the room. It's set up inside now and it's much more efficient now it recirculates heated air. I was hoping that now my treatment has finished I wouldn't need the heater. But although I don't get ill when cold, I am still feeling it more than I would have pre-C. So, I've been running it mainly on some free-supplied Kerosene which I understand, burns slightly hotter than diesel. But that free supply dried up and I'll be looking to buy it but need to find a supplier that will sell it in small quantities of 50ltrs or so since I only use around 5-7 litres a week. The last price I saw it at was 98p a litre as opposed to around £1.60 for diesel. So I'm running it on some diesel I had stored. I'm away for a while so I'll sort out a supply when I return. My tandem garage workshop is 12m x 2.8m and I set it for 15C which it can normally get to when it's above freezing outside. The last couple of days it's been around -2C for most of the day and the heater got the temperature up to 11.5C. It is located next to the lathe with a few 3D-printed mods to keep the large chips out and it keeps me toasty in that area of the garage. In the warmer months, I can disconnect it from the exhaust pipe and store it. As for PVA glue-ups, I still may have to bring them into the house to set. Same with painted items. Resin casting is a non-starter.
