Almost every emergency AC call we run in Cobb County started as a small, ignorable symptom weeks or months earlier. The unit was a little louder. The bill crept up. Cooling took a little longer. Then July hit and everything failed at once. Here are the 10 warning signs Marietta, Powder Springs, Kennesaw, and Mableton homeowners should never ignore.
1. Warm air from the vents
The most obvious symptom, and often the last one people notice because they crank the thermostat lower instead of calling. Common causes: low refrigerant from a leak, a failed compressor, or a frozen coil. All three get more expensive the longer the system runs in that state.
2. Weak airflow
Hold your hand under a supply register. If the airflow is noticeably weaker than a year ago, you likely have a clogged filter, a dirty blower wheel, or duct issues. Weak airflow eventually freezes the evaporator coil — which then takes out other components.
3. Water pooling near the indoor unit
The AC pulls gallons of moisture out of the air every day. It's supposed to drain through a PVC line to the outside. Water pooling anywhere near the indoor unit means the drain is clogged and the safety switch either tripped or hasn't yet — either way, this is a same-day call.
4. Ice on the copper refrigerant lines
Any visible ice on the copper lines going into your outdoor unit means the system is running with restricted airflow or low refrigerant. Turn the AC off, let it thaw fully, and call. Running it in that state can burn out an expensive compressor.
5. Electric bill jumped without a change in usage
AC accounts for roughly half of a Cobb County home's summer electric bill. A sudden jump usually means the system is working harder than it should — dirty coils, low refrigerant, or a failing compressor drawing higher amps.
6. Short-cycling (turning on and off rapidly)
A healthy AC runs for 15–20+ minutes at a time. If yours kicks on for 3 minutes, off for 5, on again for 3, that's called short-cycling. Common causes: oversized system, dirty filter, frozen coil, failing thermostat, or a low refrigerant charge. Short-cycling wears out compressors fast.
7. Unusual smells from the vents
Musty smells usually mean mold on the coil or in the drain pan. Burning smells can mean electrical trouble — turn the system off immediately and call. A brief 'dusty' smell when you first switch to heat in the fall is normal (dust burning off the heat exchanger).
8. Unusual noises
Grinding is often a motor bearing. Squealing can be a belt or bearing. Clicking that continues past startup is often an electrical relay issue. A loud hum from the outdoor unit with no fan spinning is a classic capacitor failure. None of these get better on their own.
9. Humidity that won't leave the house
A properly sized, properly running AC in Cobb County should hold indoor humidity around 45–55% in summer. If your home feels sticky at the thermostat setpoint, the system is cooling but not dehumidifying — often a sign of an oversized system, a short-cycling compressor, or airflow that's too high across the coil.
10. System is 12+ years old and starting to give warning signs
Any of the above symptoms on a system 12+ years old is worth a serious replacement conversation, not just a repair. We'll always give you the honest math — sometimes the repair makes sense, sometimes it's throwing good money after bad.
Talk to a locally owned team, open every day.