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AC Not Cooling

When your AC runs but won't cool, check the thermostat mode, air filter, and outdoor unit first. Refrigerant leaks and compressor failures need a pro — repairs run $150 to $5,500 depending on the fault.

Reviewed July 2026

What does ac not cooling mean?

Cooling problems often start with simple issues: wrong thermostat setting, dirty filter restricting airflow, or a tripped outdoor disconnect. Warmlo's furnace code pages cover airflow and limit faults that also affect central AC on shared systems.

What usually causes ac not cooling?

Dirty air filter restricting airflowmost common

Typical repair: $20–$75

Tripped outdoor unit breakercommon

Typical repair: $150–$400

Refrigerant leak or compressor failurepossible

Typical repair: $2,500–$5,500

Find your exact error code

Select your furnace brand to jump to the code page for this symptom.

Carrier13Limit or rollout circuit lockoutBryant13Limit or rollout circuit lockoutPayne13Limit or rollout circuit lockoutRheem13Flame was lost during operation

What should I check first when ac not cooling?

  1. Confirm the thermostat is set to Cool and the target temp is below room temp.
  2. Replace the HVAC air filter.
  3. Check that the outdoor unit fan is running.
  4. Verify the outdoor disconnect switch is on.

What a repair costs

A furnace filter replacement typically costs between $20 and $75 nationally.

Typical repair cost
$20 – $75furnace filter replacement
Where the money goes
Part $10–$50Labor $0–$65Typical labor time: 0.25 hrs

This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.