AC Running But Not Cooling? Start Here
A quick homeowner checklist for the most common no-cool causes — and how to tell when it's time to stop troubleshooting and call.
The five-minute checklist
1. Thermostat: confirm it's set to Cool, the setpoint is below room temperature, and the batteries (if it has them) are good.
2. Filter: a badly clogged filter can choke airflow enough that the house never cools. If it's dirty, change it.
3. Breakers: check the panel for a tripped breaker for the AC or furnace/air handler. Reset once. If it trips again, stop — repeated resets on a tripping breaker risk damage and indicate an electrical fault.
4. Outdoor unit: is the fan on top spinning? Is the unit packed with cottonwood fluff or debris? A gentle rinse of the coil fins with a garden hose (power off) can help a struggling unit.
5. Ice: check the copper lines at the outdoor unit and the indoor coil. If you see frost or ice, see our guide on frozen systems — and turn cooling off.
When to stop and call
If the outdoor fan isn't spinning, the breaker keeps tripping, the system is icing, or everything above checks out and it still blows warm — that's the line. Beyond it are refrigerant, capacitor, contactor, and compressor issues that need meters and gauges to diagnose safely. Booking online takes about a minute, and a proper diagnosis beats parts-cannon guessing every time.
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