6 Best RV Furnaces For Staying Warm During Winter Trips

Waking up to a frost-covered windshield is a rite of passage for every winter traveler, but shivering through the night is entirely optional. Choosing the right heating system determines whether your rig becomes a cozy sanctuary or a damp, freezing box. Let’s look at the best ways to keep the mercury up when the temperature outside drops.

Disclosure: As an Amazon Associate, this site earns from qualifying purchases. Thank you!

Understanding Winter RV Heating Requirements

Heating an RV is fundamentally different from heating a sticks-and-bricks home because you are essentially living inside a giant, poorly insulated radiator. Your primary goal is to balance BTU (British Thermal Unit) output against your rig’s thermal envelope, which is often riddled with thermal bridges and thin walls.

Beyond raw heat, you must account for the "hidden" costs of winter living: battery draw, propane consumption, and moisture control. A furnace that is too powerful will cycle on and off constantly, leading to uneven temperatures and excessive battery drain from the fan motor. Conversely, an undersized unit will run continuously, exhausting your fuel supply and leaving you cold during extreme snaps.

Suburban SF-Series: The Reliable Industry Standard

If you’ve spent any time in a traditional travel trailer or fifth wheel, you’ve likely encountered a Suburban SF-series furnace. These are the workhorses of the RV world, prized for their straightforward design and the fact that parts are available at virtually every dealership in North America.

They are best suited for those who want a "set it and forget it" system that integrates perfectly with standard RV ducting. While they can be a bit noisy and hungry for 12V power, their reliability is unmatched. If you value ease of repair over cutting-edge efficiency, the Suburban is your go-to choice.

Atwood Everest Star: Compact Forced Air Heating

The Atwood Everest Star is the master of tight spaces, specifically designed for rigs where floor real estate is at a premium. Its low-profile design allows for installation in areas where traditional furnaces simply wouldn’t fit, making it a favorite for smaller Class C motorhomes and older campers.

Because of its compact stature, it excels in setups where ducting runs are short and direct. It’s a solid, middle-of-the-road performer that balances decent heat output with a smaller physical footprint. If you are retrofitting a rig with limited utility space, this is likely the most headache-free solution available.

Truma VarioHeat: The Quiet Efficiency Solution

The Truma VarioHeat is in a different league regarding comfort and technology. It operates with a sophisticated digital control panel that allows for precise temperature regulation, and it runs significantly quieter than the standard industry furnaces.

This unit is perfect for the full-timer who spends long periods in cold climates and values a consistent, non-intrusive heat source. It’s an investment, but the efficiency gains and the reduction in "fan noise fatigue" are well worth the premium price. If you want a luxury-grade heating experience, this is the gold standard.

Diesel Air Heaters: Top Choice for Dry Heat

Diesel air heaters have become the darling of the van conversion community for a reason: they are incredibly fuel-efficient and produce an exceptionally dry heat. By pulling fuel directly from your vehicle’s tank or a dedicated auxiliary tank, they eliminate the need to hunt for propane refills in remote areas.

These heaters are ideal for those who prioritize off-grid capability and moisture management. Because they burn outside air and vent exhaust externally, they don’t add humidity to your interior—a massive advantage for preventing condensation. If you are building a van or a small camper and want to extend your season into the deep winter, a diesel heater is the smartest move you can make.

Propex HS2000: Best for Small Van Conversions

The Propex HS2000 is a compact, high-efficiency propane furnace that is remarkably easy to install in small footprints. Unlike large RV furnaces that require massive ducting, the Propex is designed to be tucked into a cabinet or under a seat, pushing heat directly into the living space.

It is the quintessential choice for professional-grade van builds where efficiency and silence are paramount. It’s not designed to heat a 40-foot fifth wheel, but for a camper van, it provides the perfect balance of heat-on-demand and low power consumption. If you are building a compact rig, stop looking and start installing a Propex.

Camco Olympian Wave 3: Radiant Propane Power

The Wave 3 is a catalytic heater, meaning it operates without a fan and uses a chemical reaction to produce radiant heat. It is silent, uses no electricity, and is incredibly efficient with propane, making it a favorite for those who boondock without battery power.

However, it comes with a major caveat: it does not vent outside, meaning you must leave a window cracked for oxygen and moisture ventilation. It is a fantastic supplemental heat source for mild to moderate cold, but it should never be your primary heat source in sub-zero conditions. Use this if you want silent, off-grid comfort, but always prioritize safety and ventilation.

Essential Safety Tips for Propane RV Furnaces

Propane furnaces are safe, but only when the installation and maintenance are impeccable. Every furnace must have a clear path to draw fresh air from outside and exhaust combustion gases externally; never block these ports with snow or debris.

You should always have a functioning carbon monoxide detector installed at sleeping level, as propane combustion can be dangerous if the heat exchanger develops a crack. Keep your furnace burner clean and ensure the sail switch—the safety mechanism that ensures the fan is running before the gas ignites—is free of dust. Never skip an annual inspection of your gas lines to prevent leaks.

Proper Venting and Condensation Management

Condensation is the silent killer of RV interiors, often caused by the very heat sources we use to stay warm. Burning propane releases water vapor into the air, which quickly condenses on cold walls and windows.

To manage this, ensure your furnace is properly vented to the exterior and consider using a dehumidifier if you are in a humid climate. Proper airflow is essential; even in the dead of winter, you must allow for a small amount of cross-ventilation to prevent mold and rot. Think of your RV as a living, breathing system that needs to shed moisture just as much as it needs to gain heat.

Calculating BTU Needs for Your Specific Rig

To determine your heating needs, use a general rule of thumb: 1,000 BTUs per foot of RV length for moderate climates, increasing to 1,500 BTUs for true winter conditions. However, this is just a baseline; a rig with double-pane windows and extra insulation will require significantly less power than a single-pane, uninsulated camper.

• Small Vans/Campers: 2,000–6,000 BTUs
• Medium Travel Trailers: 12,000–20,000 BTUs
• Large Fifth Wheels/Class A: 25,000–40,000+ BTUs

Always consider your insulation levels when making a final decision. If you are unsure, err on the side of a slightly larger unit with a multi-stage burner, which allows for lower power consumption while still providing the capacity to tackle a deep freeze.

Winter travel is incredibly rewarding if you aren’t fighting the cold every hour of the day. By matching your heating system to your rig’s specific needs and your personal travel style, you turn your RV into a true four-season home. Stay warm, stay safe, and enjoy the quiet beauty of the off-season.