HVAC Repair in Morristown, TN
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 Hamblen County will get in touch.
Tell us about the job
It takes about a minute.
Morristown runs its system almost all year
Heat runs October through April here, then cooling takes over for May through September. That leaves the furnace and the air conditioner with only a few weeks off between them each year. Winter nights average 30°F, cold enough that the furnace cycles on and off through the night to hold the house steady. Summer afternoons average 86°F, and the air conditioner answers back with long run times to keep up.
Most homes in Hamblen County heat with electricity, so a furnace or heat pump problem shows up fast. The area has seen 19 winter storms and 59 damaging wind events over the past ten years, and storms like those knock out power. Across Tennessee, one household in five lost power for at least 24 hours in 2024. A system that was already working hard to keep the house warm or cool has that much less room to recover once the power comes back.
- 7 months
- October through April, your system heats
- 5 months
- May through September, it cools
- 30°F
- the average winter night it heats against
- 86°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- Why is my heat not working?
- Most often it is the thermostat, a tripped breaker, or the igniter. If the furnace is electric or the blower runs on electricity, check the breaker panel first, since a tripped breaker will stop the whole system cold. Gas furnaces that won't fire are often a bad igniter or a flame sensor that has gone dirty and is telling the system not to light. If the thermostat screen is blank or won't respond, that can look like a dead furnace when it's really just the thermostat losing power. Winter nights here average 30°F, so a furnace that's down for even a day is worth calling in fast.
- Why is my system running but not cooling the house?
- The blower is moving air, but something is stopping that air from actually getting cold. A dirty filter is the most common cause, since it chokes off airflow across the coil until the coil ices up and stops cooling. Low refrigerant from a leak will do the same thing, and so will a coil that's caked with dirt. Check the filter first. If it's clean and the air still isn't cold, the system needs a contractor to check refrigerant levels and the coil itself.
- What can I check before calling for HVAC repair?
- Start with the thermostat. Make sure it's set to heat or cool as needed and the batteries aren't dead. Next, check the breaker panel for anything tripped, since that alone explains a lot of no-heat and no-cool calls. Pull the air filter and look at it in the light. If it's gray and matted, replace it before you do anything else, since a clogged filter can mimic a bigger problem. If the outdoor unit has power but isn't running, check that nothing is blocking it, like leaves or debris after a storm. If all of that checks out and the system still isn't working, a contractor will need to look at it directly.