Inspect the heat exchanger
The part that keeps combustion gases out of your home. A crack makes the furnace unsafe to run.
Furnace repair in San Bernardino, CA
San Bernardino winters are mild, so the furnace sits idle for most of the year, and that is exactly why it fails on the first cold night. Golden Comfort AC & Heating Repair repairs furnaces and heat pumps in San Bernardino, Rialto, Fontana and nearby communities, with emergency service 24/7.
The price in plain numbers
Most San Bernardino furnace repairs run about $220 to $490, and major repairs run $900 to $1,800. The diagnostic call is typically $79 to $119. See the furnace repair pricing guide.
Examples of our work
Safety first
Turn the furnace off and get help right away if you smell gas, a carbon monoxide alarm sounds, you smell burning that does not fade, or you hear loud banging. Leave the house and call 911 or your gas utility from outside.
Test your carbon monoxide detectors every fall. The CPSC carbon monoxide guide explains what to do.
What a fall furnace checkup covers
Clean burners and ignition assemblies
Dust and soot after months of sitting can cause rough ignition or a furnace that lights and shuts off.
Examine gas and pilot lines
We check connections and supply lines for leaks and wear.
Test carbon monoxide detectors
A working alarm is your last line of defense. We confirm they work and are placed correctly.
Change air filters and check the thermostat
A clean filter protects the blower, and correct thermostat settings prevent no heat calls that are not really breakdowns.
Common furnace problems
- Furnace lights and shuts off. Often a dirty flame sensor.
- No heat at all. Thermostat, ignitor, switch or control board.
- Short cycling from a dirty filter or blocked registers.
- Blower not running because of a capacitor or motor.
- Cold air from a heat pump. A stuck reversing valve or defrost problem.
Repair prices
| Repair | Typical cost |
|---|---|
| Service call | $79 to $119 |
| Average common repair | $220 to $490 |
| Average major repair | $900 to $1,800 |
| Flame sensor cleaning | $120 to $220 |
| Heat exchanger replacement | $1,200 to $2,400 |
Rules on gas furnaces
In June 2025 the South Coast Air Quality Management District voted 7 to 5 not to approve proposed rules that would have phased out gas furnaces and water heaters, so Rule 1111 as amended in 2023 remains in effect.
See the district's page. Nothing today requires you to replace a gas furnace with a heat pump.
Winter in the Inland Empire
Winters in San Bernardino are mild, but the nights are cold enough that a failed furnace is a real problem, especially for children and older family members. Dry wind events carry dust that settles in filters and around furnaces, and a clogged filter is one of the most common reasons a furnace overheats and shuts down.
Because the furnace is used for only a few months, the failures we see are mostly from sitting idle: dust and soot in the burner area, a weak ignitor and a flame sensor with a thin film on it. A fall checkup finds these before the first cold night.
What to leave to a technician
You can change the filter, check thermostat settings and keep the area around the furnace clear. Do not open the burner area, adjust gas valves or bypass safety controls. Those parts handle gas and combustion.
Where we serve
We serve San Bernardino, Rialto, Fontana, Colton, Highland, Redlands, Loma Linda and Ontario. See AC repair in San Bernardino and all of our locations.
Brands we service
We repair and install all major brands. Each brand page lists the models we install, the problems we see most and what the warranty typically covers. See how we match a technician to your brand.
San Bernardino, CA on the map
Common questions
How much does furnace repair cost in San Bernardino?
Most repairs run about $220 to $490. Major repairs run $900 to $1,800. The diagnostic call is typically $79 to $119.
Why does my furnace shut off after lighting?
A dirty flame sensor is the most common cause. Call us if a new filter does not help.
Should I test my carbon monoxide detectors?
Yes, every fall, and replace batteries. They are your protection against a leak.
Do I have to replace my furnace with a heat pump?
No. Nothing requires it today in San Bernardino.
Do you offer emergency heating repair?
Yes, 24/7.
Talk to a person
Call any hour for emergency service, or reach us during business hours for a visit or a quote.