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Furnace Not Heating

Gas furnace runs but no heat, or will not start, in a Utah winter. Safety first, safe checks, typical repairs and costs.

Safety first. If you smell gas (a rotten egg smell) or hear hissing near a gas appliance, leave the building now. Do not use light switches, phones or anything that can spark inside. From a safe place, call 911 and your gas company (Enbridge Gas Utah emergency line: 1-800-767-1689). (Source: Enbridge Gas) If a carbon monoxide alarm sounds or people feel headache, dizziness, nausea or confusion, get everyone outside to fresh air and call 911. (Source: U.S. Centers for Disease Control and Prevention; U.S. Environmental Protection Agency) Do not try to repair gas, refrigerant or electrical parts yourself.

Safe things to check

Set the thermostat to Heat and a few degrees above room temperature.
Check the air filter. ENERGY STAR says to check the air filter every month, change it if it looks dirty, and change it at least every 3 months. A dirty filter slows airflow, makes the system work harder and can lead to early failure. (Source: ENERGY STAR (U.S. EPA))
Make sure the furnace door or panel is closed; many furnaces will not run with it open.

Stop here

If you smell gas, leave now. If you smell gas, leave the area right away, warn others, and from a safe place call 911 and Enbridge Gas Utah at 1-800-767-1689. Do not turn gas valves on or off, do not use switches, phones or anything that can spark near the leak, and do not start vehicles nearby. Gas leaks cannot be reported online. (Source: Enbridge Gas) Do not relight pilots, open the burner area, or adjust the gas valve.

What a technician checks

Angi says the ignitor fails more than any other furnace part, and flame sensors are another common, low-cost fix. ENERGY STAR says a heating check-up should cover gas connections, gas pressure, burner combustion and the heat exchanger. (Source: Angi; ENERGY STAR (U.S. EPA))

Typical cost

Angi: national average furnace repair $318, most between $133 and $505; ignitor $150 to $250 ($350 to $500 after hours); flame sensor $150 to $250. (Source: Angi) National figures; not a quote.

Need a technician? Send a request to Refrigerate.
Refrigerate LLC in Lindon has HVAC-certified technicians and reviews every request. Prefer to talk? Call or text (801) 899-2171.

Refrigerate runs this site. Not for emergencies: for a gas smell or CO alarm, leave and call 911.

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FAQ

Can I fix this myself?

Only the simple checks listed above. Gas, refrigerant and electrical work needs a trained HVAC technician.

Can this site tell me what is wrong with my furnace or AC?

No. Utah HVAC Help is general information, not a diagnosis. Gas, refrigerant and high-voltage electrical parts need a trained HVAC technician. If you smell gas or a CO alarm sounds, leave the building and call 911 and your gas company from outside.

Sources

Report Gas Emergency (Utah, Idaho and Wyoming), Enbridge Gas
Heat and Cool Efficiently, ENERGY STAR (U.S. EPA)
Maintenance Checklist, ENERGY STAR (U.S. EPA)
How Much Does the Average Furnace Repair Cost? (2026 data, updated Sep 25, 2026), Angi
Carbon Monoxide (CO) Poisoning Basics, U.S. Centers for Disease Control and Prevention

Last checked October 27, 2026. Prices and rules change; confirm with the source before you rely on them.