Mobile Home Furnace Not Working? Start Here

Why manufactured-home furnaces are different

• Downflow, in a closet. Most manufactured-home furnaces sit in a hall closet and blow heat down into a main duct that runs under the floor, often called the belly duct. Crossover ducts carry air to the other half of a double-wide. A crushed, disconnected or torn duct under the house can make the furnace look like it isn't working when it's really heating the crawlspace.
• Sealed combustion. Many of these furnaces pull combustion air from outside through a roof vent and exhaust out the same way. A damaged or blocked roof jack can shut the furnace down.
• The closet door is part of the system. A lot of these furnaces pull return air through a louvered closet door. Stack storage against it, or swap it for a solid door, and you starve the furnace of air.
• Replacement units are specific. A manufactured home needs a furnace approved for manufactured-home use. A standard furnace for a site-built house isn't a legal swap.
• Propane is common. Out in Golden Valley, Chino Valley and the rural parts of Mohave and Yavapai counties, many of these furnaces run on propane.

Six checks you can do before you call

1. Thermostat. Set it to Heat, a few degrees above room temperature. Replace the batteries if it uses them.
2. Power. Check the breaker and the service switch near the furnace. It often looks like a light switch and gets bumped off.
3. The filter. In many manufactured homes it sits behind the louvered door or under a grille at the furnace. After a dusty summer it can be packed solid, and a furnace that can't breathe overheats and shuts itself off.
4. The closet door. Clear anything stacked against the louvers or inside the closet. Gas furnaces need air to burn, and stored items shouldn't be that close to the heat anyway.
5. Fuel. If you're on propane, check the tank gauge. If your stove or water heater is also out, it's probably a fuel problem, not a furnace problem.
6. The roof vent. From the ground, look for a damaged, bent or blocked vent cap, especially after a windy day or a storm.

If you smell gas or propane, don't relight anything. Get everyone out and call 911 or your gas or propane supplier from outside. Call us once you're safe.

When to stop and call

• The furnace clicks, tries to light and shuts off, or a pilot won't stay lit.
• The blower runs but the air from the floor registers stays cool.
• You hear the blower but feel weak air at the registers. That often points to the belly or crossover duct.
• It runs a few minutes and quits, over and over.
• A breaker trips again after one reset.
• It's 15 years old or more and this is the second repair this season.

Why the ducts under the floor matter

With a manufactured home, a lot of heating problems aren't in the furnace at all. Belly ducts sit under the floor where critters, wind and time get to them. A crossover duct can come loose, sag or get crushed, and suddenly the far bedrooms never warm up. We check static pressure and inspect accessible runs under the home for disconnects, crushes and leaks. We went into the duct side in more detail in our post on manufactured home HVAC in Golden Valley.

What we do on a manufactured-home heating call

We test the igniter or pilot, the flame sensor, the inducer and the safety switches, the gas valve, the control board and the blower. We look at the venting and the roof jack, and we inspect the heat exchanger, because a cracked one is a carbon monoxide problem. Then we show you what we found and give you the repair price before we start.

Manufactured-home furnaces and package units are a big share of our heating work. Plenty of contractors would rather not deal with them. We do. Most calls end in a repair. If the furnace is past its life, we'll price a replacement with the right manufactured-home-approved equipment next to the repair. See our furnace repair page and heating repair page for the rest of what we cover.

If your furnace is gas and it's the "clicks then quits" kind of problem, our post on what to check when a furnace won't turn on covers the common causes too.

Get it checked before it gets colder

A tune-up cleans the burners, flame sensor and blower, checks the safety controls and catches weak parts before a freezing night does. Our seasonal tune-up is $69 (normally $79) through December 31, 2026.

Common questions

Can I put a regular house furnace in a mobile home? No. A manufactured home needs a furnace that is approved for manufactured-home use. A standard furnace for a site-built house isn't a legal swap, even if it looks like it would fit.

Where is the filter on a mobile home furnace? In many manufactured homes it sits behind the louvered furnace closet door or under a grille at the furnace itself, not in a hallway return like a site-built house. If you can't find it, we'll show you on the next visit.

Do you work on propane furnaces? Yes, often. Propane furnaces are common in Golden Valley, Chino Valley and the rural parts of both counties.

Is it worth fixing an old mobile home furnace? Often it is. If it's past 15 years, needs a repair every winter or has a cracked heat exchanger, we'll price a replacement next to the repair so you can compare both numbers.

We're veteran-owned and serve Golden Valley, Kingman, Dolan Springs, Bullhead City, Chino Valley and the rest of Mohave and Yavapai counties. Mobile home furnace not heating? Call (928) 565-6440, or text (928) 227-8441.