Could you build build a passive air heating system on that is heated by the sun on the roof or a north facing external wall? small to medium fan that is solar powered to draw the air through a network of black pipe or something, ducted into your workspace. Not super powerful, but runs whenever there is sun, so should keep a small, well insulated space at a reasonable temperature all the time so its not a mission to heat up a bit more when you want to use it. Should also reduce the amount of condensation your getting.
Seems to be a common thing on houses in places like Scandinavia/Canada/Alaska.
It probably wont be the whole solution, but it might mean you can use a much smaller heater for less time.
Bookmarks