Im working this weekend in my well insulated paint booth with 2 180 watt 5ft tube heaters and a 2kw radiant heater and its 19c. This means i can do all the bodywork on the panels (filling sanding etc)
I then get as many panels as i can ready for paint and then turn the extract fan on with just enough airflow to clean the air of spray mist ( speed controller on the fan) i then place the radiant heater outside the booth next to the filter intake to coalesce the intake air. The temp drops to 11c with this colder air intake. I use extra fast activator due to this and monitor the air humidity and the dew point of the air/steel.
Its all well within the parameters of the paint (primer/mid coat) so all good.
So as i finish painting and the solvent smell drops i bring the heater back in to bring the temp back up.
I have set my shop up in zones so i can heat the areas i will be inactive and not keeping warm by exercise (office toilet, paint booth for the paints and conditions required)
This way i keep my heating bills down and only heat the areas that need it. The heater fan i have just made can only knock the chill off and not heat the full shop, so when i am out there i have to stay busy. I basically jump between warm zones when i can.