Is your HVAC system running non-stop—even when it shouldn’t be? While it might seem like it's just working hard on a hot day, a unit that won’t shut off can signal a deeper problem. Not only can this drive up your energy bills, but it can also wear down your system faster than normal.
Let’s walk through the most common causes—and what to do next.
Why Won’t My HVAC Turn Off?
There are several potential reasons why your system keeps running:
- Thermostat Issues – Sometimes the problem isn’t with your HVAC system at all—it’s the thermostat. If it’s set too low, has faulty wiring, or isn’t reading the room temperature accurately, it may never send the signal to shut off.
- Dirty Air Filters – When your filters are clogged, airflow is restricted. Your system has to work harder and longer to reach the desired temperature.
- Leaky Ducts or Insulation Problems – If cool air is escaping before it ever reaches your rooms, your HVAC will run constantly trying to compensate.
- Frozen Evaporator Coil – A frozen coil reduces your system’s cooling power, meaning it has to stay on longer to do the same job.
- Fan Set to “On” Instead of “Auto” – If your thermostat fan setting is switched to “On,” it will keep blowing even when your home has reached the right temperature.
What You Can Try First
Before calling for help, try a few quick checks:
- Make sure the thermostat is set correctly (and not on “Fan On”).
- Replace your air filter if it looks dirty.
- Inspect your vents to ensure nothing is blocked.
- Gently feel around your unit for signs of ice or freezing.
If none of that works—or if your system still won’t shut off—it’s time to bring in a pro.
Let Aire Serv of Bel Air Help
When your HVAC won’t stop running, you don’t have to troubleshoot alone. At Aire Serv of Bel Air, we’ll take a close look at your system, identify the issue quickly, and get things back to normal. Whether it’s a minor adjustment or a more serious repair, you can count on us to deliver reliable service without the guesswork.
