Furnace Repair in Twin Falls, ID
Furnaces here run from September through May. If yours quits, tell us what it's doing and a licensed contractor who covers Twin Falls County will get in touch.
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Nine months of heat a year wears a furnace down
Your furnace runs from September through May here, nine months of the year. On winter nights that average 21°F, it cycles on and off for hours at a stretch to keep up. Each start puts a load on the igniter and the flame sensor, and over enough winters those are the parts that fail first. You notice it as a furnace that clicks but won't light, or one that runs for a minute and shuts itself off.
More than half the homes in the area heat with gas, so a lot of furnaces here are doing this same work night after night. Twin Falls County has also seen 19 winter storms and 28 damaging wind events over the past ten years, and statewide, about 1 in 10 households lost power for a day or more in 2024. When the power drops in the middle of a cold night, a furnace that was already struggling may not come back on the way it should.
- 9 months
- September through May, your furnace is on duty
- 21°F
- the average winter night it heats against
- 54%
- of homes here heat with gas, so most furnaces here burn gas
- 19 winter storms
- in ten years, the nights a failure hurts most
NOAA nClimDiv, 1991–2020 normals
A new furnace would cut about $80 a year off heating for a typical Twin Falls County home.
Estimates for a typical Twin Falls County home, compared with an older unit built to the previous federal minimum, from EIA household energy data, Idaho fuel prices and NOAA climate normals. Your home will differ.
Repair makes sense when one part has failed and the heat exchanger is sound.
Replacement makes sense when the heat exchanger is cracked or the furnace keeps needing parts.
Idaho requires HVAC contractors to hold a state license.
Idaho's license is held by the contractor, not issued per job, so it covers the person doing the work rather than this specific repair. The HVAC Board is the body that licenses them, which means there is a state record of who is qualified to take on a furnace repair in Twin Falls County.
For a furnace repair, the gas connection is the part that matters most, since that is where a mistake turns dangerous. In a state that licenses HVAC contractors, that risk is what the license is meant to cover. More than half the homes in Twin Falls County heat with gas, so this is the kind of repair the license exists for.
Sources: Idaho Legislature · Idaho Division of Occupational and Professional Licenses
- Why won't my furnace turn on?
- Start with the thermostat. If the display is blank or won't respond, check the batteries before anything else. If the thermostat looks fine, check the breaker and the furnace's own power switch, the one that looks like a light switch near the unit. A closed gas valve or a furnace filter clogged enough to trip a safety switch will also keep it from starting. If none of that gets it running, the ignition system or a safety control has likely failed, and that's a job for a contractor to diagnose.
- Why is my furnace blowing cold air?
- Most often the furnace is stuck on fan-only, or the burners aren't lighting even though the blower still runs. Check that the thermostat is set to heat, not just fan, and that the temperature is actually set above room temperature. If the setting is right and you're still getting cold air, the igniter or flame sensor may be failing, which stops the burners without stopping the blower. That leaves air moving through the ducts with nothing heating it.
- Why won't my furnace pilot light stay lit?
- A pilot that won't stay lit usually means the thermocouple has worn out. That's the small sensor that sits in the pilot flame and tells the gas valve it's safe to keep the gas flowing. When it fails, the valve shuts the gas off as a safety measure, even though the pilot lit fine a moment earlier. A draft blowing out the flame or a dirty pilot orifice can cause the same thing, but a thermocouple that's simply worn out is the most common cause. This is a gas system repair, so have a licensed contractor replace the part rather than trying to keep relighting it.