I use a cheap 2kw fan heater from argos, cost about a tenner. I put it on for an hour before I want to work in the garage and it makes a world of difference, especially when there is frost on the inside of the walls. If it's really cold I also use a 3 bar halogen heater aimed at where I'm working.
It works well, but last year i found that i had to turn them both off to use the welder, or it stays dark when i lift the mask up!
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