I keep one of those rectangular coolers in the kitchen for just this purpose. Put the dough in the cooler with a teakettle fresh off the stove (on a trivet, of course) and you're in business. I usually reheat the teakettle once every 45 minutes or so.
kitchenelf..........I use an old fashioned lamp and place it over the bread dough and they love it.......keep in mind it can get to minus 40 degrees here.........never had a problem