RV furnaces are notorious propane hogs, and most owners assume that’s just how they work. A typical RV furnace can burn through 1-2 gallons of propane per day in cold weather, which seems excessive compared to home heating systems. The real culprit isn’t the furnace itself — it’s usually poor air circulation and heat distribution throughout the RV.
Most RVs have a single furnace located in one area (often under a dinette or bed) with ductwork that doesn’t effectively reach all living spaces. The furnace cycles on and off based on the thermostat location, which might be getting adequate heat while the bedroom or bathroom stays cold. This causes the system to run almost continuously trying to heat areas the warm air never reaches.
The solution most experienced RVers use is strategic fan placement rather than running the furnace harder. A small 12V fan positioned to move warm air from the furnace area toward cold spots can dramatically reduce propane consumption. Some owners install small computer fans in problem areas, while others simply use a portable fan to circulate air during heating cycles.
Another factor many miss is that RV furnaces pull combustion air from outside but use interior air for circulation. In windy conditions, the constant air exchange makes the furnace work much harder. Parking strategically to block wind, or even temporarily covering exterior vents during extreme cold, can cut propane usage significantly without affecting safety.