How will using an electric heater in the cold create condensation? It doesn't add moisture to the air, so there's nothing (new) to condense out. If anything, it would (temporarily) remove condensation as the warmer air can hold more moisture, and some of the already condensed water will evaporate or sublime into water vapor.
If you're in with the electric heater, breathing and perspiring, you will of course be adding moisture to the air that can condense out...but that's also true if you're in there without the heater.
IMHO, an electric space heater or two makes a dandy load for the generator. At some times of the year, the combination of a heater and the air conditioner works well, too.