HVAC Repair in Johnson City, TN
Homes here need heat from October through April and cooling from June through September. If your system quits, tell us what it's doing and a licensed contractor who covers Washington County will get in touch.
Tell us about the job
It takes about a minute.
Eleven months of work, most years
Your system in Washington County gets almost no rest. Heat runs October through April, seven months, then cooling takes over for four more. That leaves one month where the furnace or the AC isn't carrying the house.
Winter nights averaging 29°F mean the burner or the heat pump cycles on and off for hours at a stretch, and each cycle puts wear on the igniter and the parts that start it. Summer afternoons near 85°F push the compressor hard for a full season, not just a few hot weeks. Most homes here heat with electricity, so when a storm knocks out power, the heat goes with it. Washington County has seen 30 winter storms and 40 damaging wind events over the past ten years, and a fifth of Tennessee households lost power for a day or more in 2024 alone. When the power comes back, most systems restart on their own, but if a storm surge or a hard freeze already damaged a part, it won't.
- 7 months
- October through April, your system heats
- 4 months
- June through September, it cools
- 29°F
- the average winter night it heats against
- 85°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- Why is my heat not working?
- Start with the thermostat and the breaker before anything else. If it runs on gas, check whether the pilot or igniter lit and whether the flame sensor is dirty, since a dirty sensor will shut the burner off soon after it starts. If it runs on electricity, a tripped breaker or a bad heat strip can leave you with air moving but no warmth. With winter nights here averaging 29°F, a furnace that short cycles or won't stay lit needs a contractor out soon rather than waited on.
- Why is my system running but not cooling the house?
- The fan is moving air but something between the coil and the room is not doing its job. A dirty filter or a coil caked with dust blocks airflow and the air coming out feels barely cool. Low refrigerant from a leak does the same thing, and only a contractor with gauges can confirm that. Check the filter first. If it's clean and the vents are open and unblocked, the problem is likely inside the unit.
- What can I check before calling for HVAC repair?
- Check the thermostat is set to heat or cool and not sitting on the wrong mode. Check the breaker for the furnace or air handler hasn't tripped. Pull the filter and hold it up to a light, and replace it if you can't see through it. Walk around and make sure nothing is blocking a vent or the outdoor unit. If the system still isn't heating or cooling after that, a contractor will need to look at what's inside it.