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Gas furnaces, heat pumps and wall heaters
Heating and Furnace Repair in Los Angeles
LA nights get cold, especially in the Valley, and furnaces tend to fail on the first chilly evening of the year after sitting unused all summer. Here is what usually goes wrong, what it costs, and when to turn the heat off and call.
- Gas furnaces in attics, closets and crawl spaces
- Heat pumps and wall heaters, common in older LA apartments
- Safety first: gas smell and carbon monoxide come before everything else
Typical furnace repair costs
- Average furnace repair about $318
- Most repairs $133 to $505
- Igniter $150 to $500
- Flame sensor $150 to $250
- Control board or gas valve $200 to $600
US national 2026 figures (HomeAdvisor, June 2026). LA prices usually sit toward the higher end.
Safety first
Smell Gas? Do This Before Anything Else
Gas smell or CO alarm
If you smell gas (a rotten egg smell) or your carbon monoxide alarm goes off, do not switch the furnace or lights on or off. Get everyone out, then call 911 and SoCalGas from outside. An HVAC visit comes after the gas company or fire department says it is safe.
California requires carbon monoxide alarms in homes with gas appliances or an attached garage. If yours is missing or more than about 7 to 10 years old, replace it before heating season. Most alarms print an end-of-life date on the back.
Repairs
Common Furnace Problems in LA Homes
| What you notice | Likely causes | Typical cost (US 2026) |
|---|---|---|
| Blower runs, but air is cold | Igniter, flame sensor, gas valve, or the furnace locking itself out after failed starts | $150 to $600 |
| Furnace starts, then shuts off within a minute | Dirty flame sensor (very common after a summer of dust), clogged filter, overheating | $150 to $250 |
| Nothing happens at all | Thermostat, tripped breaker, blown fuse, door safety switch, control board | $100 to $600 |
| Burning smell on first use | Usually dust burning off the heat exchanger. Should fade within an hour. If it does not, turn it off. | Often no repair needed |
| Loud bang when it lights | Delayed ignition from dirty burners. Get it checked. | Cleaning or burner service |
| Blower will not stop running | Thermostat set to fan “on”, or a stuck relay on the board | $0 to $600 |
| Yellow or flickering flame | Poor combustion. Turn it off and have it inspected for safety. | Varies |
The first cold night is the busiest. Furnaces in LA sit idle for months and collect dust in hot attics. A dirty flame sensor or filter is behind many “it ran for a minute then quit” calls, and both are quick fixes.
LA systems
Heating Systems We See Across Los Angeles
- Forced-air gas furnaces. Standard in Valley ranch homes, usually paired with central AC and often installed in the attic or a hall closet.
- Wall and floor heaters. Common in older apartments and 1920s to 1950s bungalows across Hollywood, Koreatown and Mid-City. Many are decades old and worth inspecting for safety.
- Heat pumps. Increasingly common because LADWP rebates for heat pumps are far larger than for AC. See heat pumps.
- Ductless mini-splits. Most can heat as well as cool, and they often replace old wall heaters. See mini-splits.
Repair or replace
When to Replace an Old Furnace
Furnaces in LA often last a long time because they run so few hours a year. Age alone is not a reason to replace one. These are:
- A cracked heat exchanger, which can leak carbon monoxide. This is a safety issue, not a comfort one.
- Repeated failures that add up close to the cost of a new unit.
- Your AC also needs replacing. Replacing both at once, or switching both to a heat pump, is often cheaper than doing them separately.
In the City of LA, furnace replacement normally needs an LADBS mechanical permit, the same as an AC. The $5,000 rule (age × repair cost) works for furnaces too.
Before you call
Quick Checks When the Heat Will Not Come On
- Set the thermostat to heat and a few degrees above room temperature. Replace its batteries.
- Check the furnace breaker and the light-switch-style power switch near the furnace.
- Make sure the furnace door panel is fully closed. A safety switch stops it from running when the panel is loose.
- Replace a dirty filter.
- If it tries to light and fails 3 times, it may lock out. Turn the power off for a minute and try once more. If it fails again, call.
FAQ
Frequently Asked Questions
How much does furnace repair cost in Los Angeles?
National 2026 data puts the average furnace repair at about $318, with most jobs between $133 and $505. LA prices usually sit toward the higher end. Igniters run about $150 to $500, and flame sensors $150 to $250.
Why does my furnace turn on and then shut off?
The most common cause is a dirty flame sensor, which cannot confirm the flame and shuts the gas off for safety. A clogged filter causing overheating is the next most likely cause.
Is a burning smell from my heater normal?
A dusty burning smell the first time you turn the heat on in fall is normal and should fade within an hour. A burning plastic or electrical smell, or a smell that does not fade, is not. Turn the system off and call.
What should I do if I smell gas near my furnace?
Do not touch switches. Get everyone outside, then call 911 and SoCalGas. Do not go back in until it has been declared safe.
Do I need a permit to replace a furnace in Los Angeles?
Usually yes. The City of LA normally requires an LADBS mechanical permit for furnace replacement.
Should I replace my furnace with a heat pump?
In LA’s mild climate it is often worth pricing. A heat pump replaces both furnace and AC, and LADWP pays $1,000 to $1,250 per ton for ducted heat pumps.
Related
Related Services and Guides
Heat pumps
One system for heating and cooling, with big LADWP rebates.
Ductless mini-splits
A modern replacement for old wall heaters.
Indoor air quality
Cleaner air during the months the windows stay shut.
Landlords and property managers
Heat is a legal requirement in California rentals.
No heat? Call for furnace repair.
Gas furnaces, heat pumps and wall heaters across the Valley and Central LA. Price in writing before work starts.
Last updated October 2026. Prices are published 2026 Los Angeles market ranges, not quotes. Rules and rebates change, so check the official source before you buy.