I work in the back of my garage, below grade, so have a hood, light, fan, and pot plugged into an outlet strip. I unplug the pot when finished casting, turn the light off, and will leave the fan run for a few hours prior to unplugging it. While I have a hotplate, I simply don't use it. The mould is place on top of the pot and has a chance to heat up as the pot heats up.