HVAC Repair in Louisville, KY
Homes here need heat from October through April and cooling from May through September. 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.
Twelve months of work, one system
Your system does not get an off season here. It runs from October through April to keep the house warm, then May through September to keep it cool, and Jefferson County gives it a full workload both ways. Winter nights averaging 27°F mean the furnace cycles on and off for hours at a stretch, and each start puts wear on the igniter and the burner. Summer afternoons near 86°F push the air conditioner to run long stretches to keep up, and that load falls hardest on the compressor and the capacitor that starts it.
Storms add to the strain. Jefferson County has seen 249 damaging wind events and 10 winter storms over the past ten years, and nearly a quarter of Kentucky households lost power for at least 24 hours in 2024. A furnace or air conditioner that loses power and comes back on hard, or one that sits through a power surge, can end up with a tripped switch or a failed part that only shows itself the next time you need heat or cooling.
- 7 months
- October through April, your system heats
- 5 months
- May through September, it cools
- 27°F
- the average winter night it heats against
- 86°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
A new furnace and air conditioner would cut about $140 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, Kentucky 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.
Kentucky requires HVAC contractors to hold a state license.
Kentucky licenses HVAC contractors through the Department of Housing, Buildings and Construction. Getting that license means the state has tested the contractor and keeps a record of them on file. The license belongs to the contractor, not to any one job, so the same license that covers a new install covers this repair too.
For a heating and cooling repair, that license is the thing accountable for the work. Whoever shows up to do this job should be the one the state tested and has on record, not just a business name.
Sources: Kentucky Legislative Research Commission · Kentucky Department of Housing, Buildings and Construction
- Why is my heat not working?
- Most often the thermostat isn't calling correctly, the pilot or igniter has failed, or a safety switch has shut the system down. Gas furnaces have a flame sensor that will stop ignition if it's dirty or worn, and that's a common cause of no heat at all. If your system just stopped overnight, check that the thermostat has power and is set to heat before assuming the furnace itself has failed. A furnace this age and worn parts aside, with lows near 27°F here in the winter, this isn't something to leave for long.
- Why is my system running but not cooling the house?
- If the blower is running but the air isn't cold, the system is likely low on refrigerant or the outdoor unit isn't running at all. Check first that the outdoor condenser fan is actually spinning. If it's not, or if you hear the indoor blower but feel warm air at the vents, a contractor will need to check the refrigerant charge and the compressor. A dirty filter can also block airflow badly enough that the coil freezes, which will cut cooling even though the system sounds like it's working.
- What can I check before calling for HVAC repair?
- Start with the thermostat. Make sure it's set correctly and has fresh batteries if it uses them. Check the air filter next, since a clogged one restricts airflow enough to cause both heating and cooling problems. Look at your breaker panel too, since a tripped breaker will stop the system cold with no other warning. If those check out and the system still isn't heating or cooling, a contractor will need to look at it directly.