HVAC Repair in Lakewood, CO
Homes here need heat from September through May and cooling from July through July. If your system quits, tell us what it's doing and a licensed contractor who covers Jefferson County will get in touch.
Tell us about the job
It takes about a minute.
Nine months of heat, one month of cooling, and both take a toll
Your furnace in Lakewood works from September through May. On winter nights averaging 18°F, it runs long and often, and most homes here heat with gas, so the burner and igniter carry that load night after night. A worn igniter will fail to light the burner, and you will notice a house that stays cold no matter what the thermostat says.
Cooling only matters in July, but when your air conditioner turns on after months of sitting idle, whatever was already worn on it does not get better with rest. Jefferson County has also seen 113 winter storms and 114 damaging wind events over the past ten years, and outages follow both. If the power drops, most systems come back on their own, but a furnace that will not restart after an outage usually has a problem that was there before the lights went out.
- 9 months
- September through May, your system heats
- 1 months
- July through July, it cools
- 18°F
- the average winter night it heats against
- 80°F
- the average summer afternoon it cools against

NOAA nClimDiv, 1991–2020 normals
A new furnace and air conditioner would cut about $120 a year off heating and cooling for a typical Jefferson County home.
Estimates for a typical Jefferson County home, compared with an older unit built to the previous federal minimum, from EIA household energy data, Colorado fuel prices and NOAA climate normals. Your home will differ.
Repair makes sense when one part has failed.
Replacement makes sense when the furnace's heat exchanger is cracked, the air conditioner's compressor has failed, or repairs keep coming.
- Why is my heat not working?
- Start with the thermostat. Check that it's set to heat and a few degrees above room temperature, and check the batteries if it uses them. If the thermostat looks right, check the breaker for the furnace and the switch that looks like a light switch near the unit, since that shuts it off too. A furnace that won't light or blows cold air points to something inside it, like the igniter or the flame sensor, and that's a job for a contractor. With winter lows here averaging 18°F, don't wait long to get it looked at.
- Why is my system running but not cooling the house?
- Check the air filter first. A filter clogged with dust blocks airflow across the coil, and the coil can ice over when that happens, which makes the problem worse the longer it runs. Check that the outdoor unit isn't buried in leaves or debris either, since it needs open airflow to release the heat it's pulling from the house. If the filter and outdoor unit are clear and the house still isn't cooling, the system is likely low on refrigerant or has a failing part, and that needs a contractor to diagnose.
- What can I check before calling for HVAC repair?
- Check the thermostat settings and batteries, the air filter, and the breaker panel. A filter that hasn't been changed in a while restricts airflow to both furnaces and air conditioners, so replacing it is worth doing regardless of which one is acting up. Check for a tripped breaker or a furnace switch that's been bumped off. Storms are common here, with 113 winter storms and 114 damaging wind events recorded over the past ten years, so if the power flickered recently, a tripped breaker is worth ruling out before anything else.


