Northern Lite 10-2 water pump and winter camping

We have a Northern Lite 10-2 CD SE. The light in the pump/dump compartment is the one light in which you want to have an incandescent bulb. It does put out some heat. If we're using the furnace and have this light on, we're good down to about 15 degrees F. any colder than that you need to take extra measures. I also put a 3/4" thick piece of foam under the outside shower cover. -Mark.