Furnace Repair in Duncan, OK
Furnaces here run from November through April. If yours quits, tell us what it's doing and a licensed contractor who covers Stephens County will get in touch.
Tell us about the job
It takes about a minute.
Six months of heat, and the power that goes with it
Furnaces in Duncan run from November through April. On nights that average 31°F, the burner is cycling on and off for hours at a time, and every cycle depends on the igniter to light it. That part wears with each start, and a worn igniter is the reason a furnace stops mid-winter instead of at the end of it.
Stephens County also sees its share of winter storms and wind, six winter storms and 67 damaging wind events over the past ten years. Statewide, a quarter of households lost power for at least a day in 2024. When power drops and comes back, most furnaces restart on their own, but a furnace that was already struggling with a worn part may not restart clean. That is often when a homeowner notices the trouble for the first time.
- 6 months
- November through April, your furnace is on duty
- 31°F
- the average winter night it heats against
- 6 winter storms
- in ten years, the nights a failure hurts most
NOAA nClimDiv, 1991–2020 normals
Oklahoma requires HVAC contractors to hold a state license.
The Construction Industries Board tests contractors before they get that license, and it keeps a record of who holds one. The license belongs to the contractor, not to any single job, so it does not have to be renewed or reissued for the furnace at your house specifically.
For a furnace repair, that license is what stands behind the work. Furnace repair often means opening the gas line to the burner or checking the connections at the valve, and a bad connection there is the dangerous part of the job. In Oklahoma, that work falls under the same Construction Industries Board license, so the contractor doing it is the one the state has already tested and put on record.
Source: Oklahoma State Legislature
- Why won't my furnace turn on?
- Start with the thermostat. Make sure it's set to heat and set above room temperature, and check that it has power if it runs on batteries. If the thermostat looks fine, check the breaker for the furnace and the switch that looks like a light switch near the unit, since that shuts it off for service and gets bumped or left off by accident. A furnace that still won't start after that needs a contractor to check the igniter, the flame sensor, and the safety switches that block ignition when something isn't right.
- Why is my furnace blowing cold air?
- Most of the time this means the blower is running but the burners haven't lit. A dirty flame sensor is a common cause, since it shuts off gas flow when it can't detect a flame even though the igniter is working. It can also mean the furnace is in the middle of its startup cycle, when the blower runs briefly before the burners ignite. If cold air keeps blowing past that point, a contractor needs to check the flame sensor and the ignition system.
- Why won't my furnace pilot light stay lit?
- This is almost always the thermocouple, the small part that senses the pilot flame and keeps gas flowing to it. When it wears out or sits out of position, it tells the gas valve there's no flame even when there is, and the valve shuts down. A draft blowing across the pilot can also blow it out, so check nearby doors and vents first. If it keeps going out after that, the thermocouple needs to be adjusted or replaced by a contractor licensed to do gas furnace repair in Oklahoma.