I am new to wine making so I dont kow how much I can offer to the discussion boards but I did come up with a good way of maintaining the temperature during fermentation. I use a flooring radiant heat mat that is hooked up to a thermostat. I tape the thermostat probe to the side of the primary fermentor and set it so that the temperature of the must never falls below 70. pictre is attached if I did this right.

