drywall before insulation and heat?
hang the drywall in the entire house, but I would highly recommend having a permanant temperature controlled environment before the taping begins. Temporary heaters... like salamanders or any propane units will only cause problems down the road. I'm speaking from expeirence as a professional drywaller. expansion, contraction, humidity from propane, temp differences between attic with no insulation and inside house, all factors effect the drying, cracking, shrinking of the taping process.