HVAC Repair in Greenville, SC
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 Greenville County will get in touch.
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It takes about a minute.
Greenville runs its system almost year round
October through April, your furnace is working. May through September, it's the air conditioner. That is twelve months of load on one system, with barely a break between the two seasons.
Summer afternoons here climb to 87°F, so the compressor runs long hours to keep up. Winter nights average 34°F, mild enough that the heat pump or furnace cycles on and off rather than running steady, and every start puts wear on the igniter or the parts that get it going. More than half of homes here heat with electricity, so when the system struggles, there is no backup warming the house. Greenville County has seen 122 damaging wind events over the past ten years, and in 2024, 45% of South Carolina households lost power for at least a day. When the power drops and comes back, most systems restart on their own, but whatever was already worn before the outage is still worn after it.
- 7 months
- October through April, your system heats
- 5 months
- May through September, it cools
- 34°F
- the average winter night it heats against
- 87°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- Why is my heat not working?
- Start with the thermostat. Make sure it's set to heat, not just fan, and that the temperature is set above the room temperature. If that's fine, check the breaker for the furnace or air handler, since a tripped breaker will shut the whole system down with no warning. Furnaces that use electronic ignition won't light if the igniter has failed or the flame sensor is dirty, and that's a common reason for cold air or no air at all in winter. If you hear the system trying to start but it shuts off after a few seconds, that points to the flame sensor and a contractor can clean or replace it.
- Why is my system running but not cooling the house?
- The fan running without cold air usually means the problem is at the outdoor unit or in the refrigerant system, not the blower. Check that the outdoor unit isn't blocked by leaves, grass clippings, or anything sitting close against it, since airflow across that coil is how the system gets rid of heat. Next check the filter. A clogged filter starves the indoor coil of airflow and it can ice over, and once that happens the system blows air but none of it is cold. If the filter is clean and the outdoor unit is clear, the system may be low on refrigerant, and that needs a licensed contractor to diagnose since it involves checking for a leak.
- What can I check before calling for HVAC repair?
- Check the thermostat first. Confirm it's set to the right mode, heat or cool, and that the temperature setting is actually asking the system to run. Check the breaker panel next, since a tripped breaker for the furnace, air handler, or outdoor unit will stop the system cold with no error and no sound. Look at the filter and replace it if it's visibly dirty, because restricted airflow is behind a lot of the heating and cooling complaints that turn out not to be a broken part at all. If the system still won't run or still won't heat or cool the house after that, a contractor will need to look at it directly.