Some people also add a source of heat under their rig if it’s skirted. This can help a few ways. First, it can help ensure your holding tanks don’t freeze. It can also help keep your floor warmer, and the heat from your floor can radiate up, helping to keep the rest of your RV warm on colder days and nights.
Some people recommend a small electric heater while others say simply having a trouble light with a 100 watt light bulb is enough.
If you own a motorhome, travel trailer, or fifth wheel with basement storage consider adding your extra heat source there instead of on the ground underneath your RV as it makes more sense if your goal is to help keep the inside of your RV warm.
If you really wanted to keep the area under your RV warm you might want to consider adding a heat source, whether that’s a heater or a light bulb both under your rig as well as in the basement storage.
Also, since we’re talking about basement storage, consider insulating the doors, especially if they are thin and plastic like the ones under our motorhome. Simply adding a layer of the same silver bubble wrap insulation you may have used for skirting your RV to the inside of the basement storage doors can go a long way to ensuring your basement doesn’t freeze.
For example, we did this on the door to our services. We not only insulated the door, but also wrapped the whole compartment in silver bubble wrap.