How Do You Heat an RV in the Winter
Most RVs need more than one heat source to stay warm and safe through a cold night, and the right combination depends on how the RV is built and where it's parked.
Use more than one heat source, not just the furnace
The propane furnace that came with the RV is the main heat source, but it pulls battery power to run the fan and blower, and it burns through propane fast in real cold. Most people pair it with a space heater or a catalytic heater once they're plugged into shore power or a generator.
Which combination works depends on how the RV is insulated, whether the water lines and tanks are protected from freezing, and whether you're parked somewhere with electrical hookups. An RV built for three-season use needs more help staying warm than one built for winter camping.
How the RV is insulated changes what you need
Some RVs are built with winter use in mind and have better insulation, double-pane windows, and heated underbellies that keep the tanks and pipes from freezing. Others are built for mild weather and lose heat fast through the floor, windows, and slide-out seals.
If you don't know which type you have, check the owner's manual or ask the manufacturer directly. It tells you whether the holding tanks and water lines are protected or whether you need to add tank heaters and heat tape yourself.
Skirting around the base of the RV blocks wind from getting underneath and helps hold in whatever heat the underbelly has. It's one of the most effective things you can add, and it doesn't require running anything electric.
Window coverings and reflective insulation over the windshield and side windows cut down on heat loss too. A lot of the cold air you feel inside comes in through glass, not through the walls.
Where you're parked decides what runs it
If you're hooked up to shore power, you have more options. Electric space heaters and heated mattress pads work well and don't use propane, but running too many high-wattage items at once can trip the breaker, so check what the campground hookup can handle.
If you're boondocking without hookups, you're relying on propane and battery power, and both run out. A generator can recharge batteries and run a space heater for a few hours, but running a generator all night isn't something every campground or location allows.
Cold batteries also lose capacity, which matters if you're depending on battery power to run the furnace fan overnight. Keeping batteries insulated or stored somewhere warmer than the outside air helps them perform the way they're rated to.
Whatever source you use, a carbon monoxide detector and a propane detector need to be working before you rely on any combustion heater overnight. Check both before the season starts, not after you're already parked somewhere cold.
Questions people ask about this
Can you run an RV furnace all night safely?
Most RV furnaces are designed to run continuously, but they draw down your battery and propane faster than you'd expect. Check the propane level and battery charge before you sleep, and make sure the carbon monoxide detector is working, since furnaces vent exhaust outside but a blocked vent is dangerous.
How do you keep RV pipes from freezing in winter?
Heat tape wrapped around exposed pipes and a heated water hose keep water moving without freezing. Letting a faucet drip slightly also helps, and if the RV has a heated underbelly, keeping that heat source running protects the tanks as well as the pipes.
Is it safe to use a space heater inside an RV?
Electric space heaters are commonly used in RVs, but they need to be kept clear of bedding, curtains, and anything flammable, and never left running unattended for long stretches. Look for one with a tip-over shutoff and an overheat sensor, since RV interiors are small and heat builds up fast.
Do RV skirting kits actually make a difference?
Yes, skirting blocks cold wind from moving under the RV and traps whatever warmth escapes from the underbelly. It's one of the more effective, lower-cost additions for anyone parking in one spot through a cold stretch, since it works without using any extra power or propane.
How cold can an RV get before pipes freeze inside the walls?
This depends on the RV's insulation and how the manufacturer routed the plumbing, so there's no single temperature that applies to every RV. Check with the manufacturer or the owner's manual for how the specific model is rated for cold weather, and don't assume a camper advertised for three-season use handles hard freezes the same way a four-season model does.
If winter camping changes how and where you use the RV, it's worth seeing how that affects your insurance coverage too.
Before the next cold snap, check your owner's manual for how your RV's tanks, pipes, and underbelly are built to handle freezing temperatures. Test your carbon monoxide and propane detectors now, not after you've started running a heater overnight. If you don't already have skirting or tank heaters, look into adding them before you need them in an emergency. Call your campground or storage site ahead of time to ask what power hookups are available and whether generator use is allowed overnight. If you're insuring the RV as a full-time or seasonal residence, ask your insurer whether winterizing steps like this affect your coverage or your claim if a pipe does freeze.
