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Why Is My AC Blowing Warm Air?

If your AC is running but blowing warm air, check four things first: a clogged air filter, a thermostat set to FAN instead of AUTO, a tripped breaker, and whether the outdoor unit is actually running. Those cover most cases. If all four look fine, you are likely low on refrigerant or have a failed component, and that needs a technician.

Start with the four things you can check yourself

Most warm-air calls we run turn out to be one of these. It costs you nothing to look.

  1. The air filter. A filter packed with dust chokes airflow. The system runs, the air moves slowly, and what comes out feels warm. If you cannot see light through it, replace it.
  2. The thermostat fan setting. If the fan is set to ON instead of AUTO, it blows air constantly, including between cooling cycles. That air is room temperature. Switch it to AUTO.
  3. The breaker. Most systems have two breakers, one for the indoor unit and one for the outdoor unit. If only the outdoor one tripped, the fan inside keeps blowing warm air. Reset it once. If it trips again, stop and call us. A breaker that keeps tripping is telling you something is wrong.
  4. The outdoor unit. Walk outside and look. Is the fan on top spinning? If the inside is blowing but the outside unit is silent, that narrows it down fast.

Before you touch anything electrical, cut the power at the breaker. Never open the outdoor unit's electrical panel or handle refrigerant lines yourself. There is enough stored charge in some components to seriously hurt you even with the power off.

What usually needs a technician

If the basics check out, it is normally one of these, and none are DIY jobs.

  • Low refrigerant. Refrigerant is not consumed like fuel. If you are low, you have a leak. Topping it off without finding the leak just means paying again next summer.
  • A failed capacitor. A common and relatively cheap failure. The compressor tries to start and cannot.
  • A frozen evaporator coil. Ice on the coil blocks airflow completely. If you see frost on the copper lines, shut the system off and read our piece on why an AC freezes up.
  • A failing compressor. The expensive one. On an older system this is often the point where replacing makes more sense than repairing.

One Georgia-specific note

On a 95 degree afternoon, a healthy system should pull the air down about 15 to 20 degrees below what is coming in, not down to whatever number is on the thermostat. If your house is 85 and the air from the vent is 68, the system is working. It is just losing a race against the heat. That is usually an insulation, duct, or sizing problem rather than a broken AC.

Common Questions

Quick answers.

Why is my AC running but not cooling?

The most common causes are a clogged air filter, the thermostat fan set to ON instead of AUTO, a tripped breaker on the outdoor unit, or low refrigerant from a leak. The first three you can check yourself in a few minutes. Low refrigerant needs a technician, because being low means there is a leak to find.

Should I add refrigerant to my AC myself?

No. Refrigerant is not consumed during normal operation, so if you are low, you have a leak that needs to be found and repaired. Handling refrigerant also requires EPA certification. Adding more without fixing the leak means paying for it again.

How cold should the air from my vents be?

A healthy system typically delivers air about 15 to 20 degrees cooler than the air returning to it. On a very hot day the house may still struggle to reach the thermostat setting, which usually points to insulation, ductwork, or system sizing rather than a fault.

Need it looked at?

We answer 24/7, weekends and holidays included. diagnostic, waived if you go ahead with the repair.

Call 478-237-7655

Where We Work

Serving Southeast Georgia.