Furnace Repair in Rexburg, ID
Furnaces here run from September through June. If yours quits, tell us what it's doing and a licensed contractor who covers Madison County will get in touch.
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Ten months of heat in Rexburg wears a furnace down
Your furnace works nearly year round here, September through June. On winter nights averaging 14°F, it runs long stretches to keep up, and the burner cycles on and off again and again to hold the temperature. Each cycle puts wear on the igniter and the parts that control the flame.
Madison County has seen 103 winter storms and 60 damaging wind events over the past ten years. Wind like that can snuff a pilot light or knock out power, and across Idaho, 11 percent of households lost power for a full day or more in 2024. If your furnace won't restart after the lights flicker, or the burner struggles to stay lit on the coldest nights, that is what ten months of hard use does to it.
- 10 months
- September through June, your furnace is on duty
- 14°F
- the average winter night it heats against
- 54%
- of homes here heat with gas, so most furnaces here burn gas
- 103 winter storms
- in ten years, the nights a failure hurts most
NOAA nClimDiv, 1991–2020 normals
A new furnace would cut about $100 a year off heating for a typical Madison County home.
Estimates for a typical Madison 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.
The license is issued to the contractor, not to the job, so it does not need to be renewed or reissued for your specific repair. It tells you the state has tested this contractor and keeps a record of them, separate from whatever business name or truck logo shows up at your door.
For a furnace repair, that license is what stands behind the work. If the repair involves gas, a bad connection is the dangerous part of the job, and the licensed contractor is the one accountable for getting that connection right. In Madison County, where more than half of homes heat with gas, that is not a small detail.
Sources: Idaho Legislature · Idaho Division of Occupational and Professional Licenses
- Why won't my furnace turn on?
- Most often the thermostat isn't calling for heat the way it should, or power isn't reaching the furnace. Check that the thermostat is set to heat and the temperature is above room temperature. Check the breaker too, and if your furnace has a switch that looks like a light switch nearby, make sure it's on. If the furnace still won't start, the igniter or a safety switch inside may have failed, and that calls for a contractor to check it.
- Why is my furnace blowing cold air?
- If air is moving but it's cold, the burners aren't lighting even though the blower is running. That points to the igniter, the flame sensor, or a gas supply problem. It can also mean the furnace is still warming up right after it starts, since the blower can kick on before the heat exchanger is hot. If cold air keeps coming after a few minutes, have a contractor look at the ignition system.
- Why won't my furnace pilot light stay lit?
- A pilot that won't stay lit is usually the thermocouple, the small sensor that tells the gas valve the flame is burning. When it wears out or sits out of position, it reads no flame and shuts the gas off even though the pilot was lit a moment ago. A draft blowing across the pilot can also blow it out. If relighting it doesn't hold, the thermocouple likely needs to be replaced by a contractor.