Heating issues in SummerGrove, Ansley Park, the East Side neighborhoods, or the Historic District of Newnan? Here’s what it means when your furnace won’t stop running.

technician checking a old gas furnace
Why Your Furnace Keeps Running in Newnan, GA —
 And What You Should Do

When homeowners in Newnan, GA, expect their furnace to run only when it’s needed, seeing it run nonstop can be alarming. Whether you’re in SummerGrove, Ansley Park, an east-side subdivision, or near the Historic District, a continuously running furnace is a sure sign that your system is working too hard—and wasting energy. Below are the most common causes, along with your next steps.

1. A Clogged Air Filter Is Holding Your System Hostage
When the air filter becomes saturated with dust and debris, airflow drops sharply, and your furnace compensates by running nonstop. In Newnan’s humid climate, this is especially true in older homes in the Historic District or those near SummerGrove, where the filter may have been overlooked.

Check your filter—if it’s dirty, replace it. If the blower continues to run continuously, the high-limit safety switch may have been triggered, and a technician may need to reset it.

2. Leaky, Undersized, or Undersulated Ductwork
In subdivisions on the east side of Newnan and older homes near Ansley Park, ductwork may run through unfinished attics or crawl spaces with minimal insulation. When heated air escapes before it reaches your living space, the furnace continues to run, trying to meet the thermostat's call. You’ll feel warm air at some vents and barely anything at others.

A local HVAC technician from John’s Heating, Cooling & Appliance Repair will inspect your duct system, seal leaks, and ensure proper airflow.

3. Blower Motor or Control Board Malfunction
If the blower motor relay (or the control board) remains stuck in the ON position, the furnace blower will stay active even when the burners are off. This not only wastes energy but can lead to severe damage over time.

Symptoms include the blower running while vents blow cool air and higher electricity bills. At our Newnan location
 We handle these diagnostics as part of our full-service HVAC repair offerings.

4. Thermostat Set to “FAN ON” or Stuck Heat Call
Many Newnan homeowners overlook a simple solution: if the thermostat’s fan setting is left on "ON" instead of "AUTO," the blower will run continuously—even when the furnace isn’t heating.

Check your thermostat first. If it’s on AUTO and still running constantly, your system may be stuck in a permanent heating cycle and requires technician attention. Don’t Let Your System Wear Itself Out.

When a furnace runs nonstop, it can lead to:
  • Blower motor burnout
  • Heat exchanger damage
  • Skyrocketing electric bills
  • System breakdown at the worst time

✔ Stop the unnecessary wear and tear today.
✔ Keep your home safe, warm, and efficient during cold snaps.

Need Help Now? We’re Here.

Serving SummerGrove, Ansley Park, east-side subdivisions of Newnan, and the Historic District, John’s Heating, Cooling & Appliance Repair offers fast, professional furnace repair and full HVAC service. If your system is running non-stop, blowing cool air, or short-cycling, call us at (678) 603-7775 or schedule online now.

Emergency HVAC & Refrigeration Repair (24/7)

Pro Tip: Bookmark our Heating Repair Newnan page so you can check our service details 
📌 Maybe also review our AC Repair Newnan page if you haven’t already.
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