RV Furnace Replacement Cost: What to Expect in 2026

Replacing an RV propane furnace runs $900 to $2,600 installed at a shop. But most furnace failures are not replacements. A dead Suburban or Dometic unit is far more likely to have a failed sail switch ($15-$60 in parts) or a dirty blower than a dead heat exchanger. Knowing which failure you have before anyone orders parts is the most important step.

Why RV furnace repair costs less than most owners expect

The forced-air propane furnaces in travel trailers, fifth wheels, and motorhomes are purpose-built for repairability. Suburban, the dominant brand in the US market, has kept a remarkably consistent cabinet size and parts ecosystem across its NT and SF series for decades. Dometic, which absorbed the Atwood Hydro-Flame line in 2015, follows a similar modular design. Most of the components that fail are designed to be replaced without pulling the whole unit.

The blower housing, sail switch, limit switch, and circuit board are all accessible from the front of the furnace in most installations. A technician with the right replacement part can have a Suburban NT running again in under an hour for a sail switch swap, under two hours for a blower or board.

That changes when the heat exchanger cracks. The heat exchanger is the sealed metal chamber that transfers combustion heat to the air stream without mixing combustion gases into your living space. A crack in that chamber means CO and combustion byproducts enter the air you are breathing. There is no patch for a cracked RV heat exchanger. The unit gets replaced, full stop.

RV furnace repair vs. replace: decision by failure type

The table below maps the most common furnace failures to their typical repair cost and whether repair or replacement is the right call.

Shops typically charge $150-$225 per hour for RV HVAC work. A diagnostic call that pins down the failure before parts are ordered costs $150-$300 and is money well spent; the alternative is guessing at a $200 board when a $20 sail switch is the actual problem.

Unit cost by BTU output (Suburban NT series)

Suburban’s NT series is the most common furnace in US travel trailers and fifth wheels. The cabinet dimensions are standardized at 12.5 inches tall by 12 inches wide, which means a same-series replacement drops into the original compartment without modification. Here’s what the replacement cores were running in mid-2026:

Dometic’s DF series (successor to the Atwood Hydro-Flame line) runs in a similar range. The 12,000 BTU DFSD runs around $682 at RV parts suppliers; larger models scale up comparably to Suburban pricing. If you are replacing an older Atwood with a Dometic, confirm the duct outlet size and electrical connector match before ordering.

Add $300-$900 in labor for a professional installation, depending on whether it is a clean same-footprint swap or something more involved.

Same-footprint vs. modified installation

The cost gap between a simple swap and a modified installation is significant enough to check before ordering anything.

A same-footprint replacement on a Suburban NT unit uses the same four mounting bolts, the same LP supply fitting, the same 12V connector, and the same round duct outlet position. A technician does this in 3-4 hours. That is the $900-$1,400 total range.

A modified installation starts costing more when the replacement brand uses a different duct outlet position, different exhaust diameter, or different combustion air inlet location. Cutting a new exhaust penetration through the exterior of an RV means work that touches sealing, caulking, and sometimes interior cabinetry. Add 2-4 hours and $300-$600 on top of the unit and basic labor costs.

Shops doing a cross-brand swap from Atwood to Suburban, or adding a higher BTU unit to a compartment sized for a smaller one, often quote $1,800 to $2,600 all-in.

The sail switch: the most common RV furnace failure

The sail switch is a small hinged flap mounted in the blower housing. When the blower spins up, air pressure pushes the flap closed, completing a circuit that tells the control board it is safe to open the gas valve and fire the igniter. If the flap does not close, the board never fires.

Sail switches fail three ways. The most common is physical obstruction: dust, lint, pet hair, or spider webbing accumulates on the flap over a season and adds enough drag that blower airflow can no longer push it closed. Cleaning it with compressed air costs nothing. The second is mechanical wear: the hinge pin loosens or the flap warps from heat cycling. Replacement parts run $15-$60 depending on the unit. The third is a blower motor that is losing power and no longer moving enough air, which means the blower is the real problem and a new sail switch will not help.

Because the sail switch is inexpensive and accessible, many RV owners carry a spare. Diagnosis takes a multimeter and a minute; the switch should close (continuity) when the flap is manually depressed. If it does not close cleanly or if the contacts are corroded, swap it.

If you own a Suburban or Dometic furnace, the sail switch check is the first diagnostic step when the furnace runs the blower but will not light. It is also worth cleaning every season as preventive maintenance.

The repair-first economics

Running the numbers on a 6-year-old Suburban NT-30 that will not light:

A shop diagnoses a failed ignition board. The board runs $130-$180 in parts; labor at $175/hr for 1.5 hours puts the bill at $392-$555. The unit is six years old with a clean heat exchanger. A replacement unit plus installation is $1,500-$1,800.

Repair wins by $1,000 or more. The repaired furnace, maintained well, should run another 6-10 years. The only scenario where the math flips is when the diagnosis is unclear, when the board failure was caused by moisture intrusion that is ongoing, or when the unit has already had two or three prior repairs. At that point, the repair cost approaches the replacement cost and you are buying reliability, not just heat.

For older Atwood units specifically, parts availability is tightening. A shop that cannot source the board for 6-8 weeks may recommend replacement simply because the unit cannot stay down through a cold-weather trip. That is a legitimate practical reason to replace an otherwise repairable furnace.

For reference on RV systems coverage under a service contract, the furnace is typically listed as a covered mechanical component in higher-tier plans. Whether the specific failure qualifies depends on how the contract defines mechanical vs. maintenance. The extended warranty comparison guide walks through what the tier structure actually means for appliance coverage.

If the diagnosis comes back as a cracked heat exchanger and you are weighing the full replacement cost, the RV water heater replacement cost and RV refrigerator replacement cost pages are worth reading before you decide whether to bundle system replacements into one shop visit to reduce labor overhead. A lot of shops will discount total labor when three appliances come in together.

For what insurance actually covers, the warranty and insurance overview covers which failure types fall under the policy and which fall under a service contract.

How to keep furnace costs down

Annual preventive maintenance costs $100-$300 from a shop and covers the same-season diagnostic work that catches a failing blower or corroded board before it strands you at a campground in November. California RV Specialists lists their full furnace maintenance service at $300-$500 including burner chamber cleaning, LP leak test, and all component checks. That service often prevents the $400-$650 component repair call later.

Two owner-level tasks cost nothing. First: clean the combustion air inlet and exhaust terminations before each camping season. Mud daubers and wasps build nests in both openings over summer storage. A blocked exhaust causes the limit switch to trip on every firing cycle; a blocked combustion air inlet starves the burner. Screen both openings and check them at the start of every season. Replacement bug screens run $10-$20 and are worth keeping as spares.

Second: run the furnace at least once before you need it. A single test firing in early September will surface a failed sail switch or a slow blower before the first cold night of the year.

If the repair quote is coming in above $700-$800 and the unit is 12 years old or more, pull the service history and check the heat exchanger condition before committing to the repair. A cracked exchanger found after the board is replaced is an expensive lesson.