AC Blowing Warm Air? 6 Reasons and What to Check First
Meta description: Your AC is running but blowing warm air? An HVAC pro walks through the 6 most common causes, what you can check yourself, and when to call for service.
When your AC runs but the air isn't cold, it's usually one of a handful of issues. Here's how to diagnose it before the house turns into an oven.
Start with the thermostat and filter
It sounds basic, but a thermostat bumped to 'fan' instead of 'cool' and a filter clogged solid are the two most common causes we find. Swap the filter and confirm the setting before assuming the worst.
Check the outdoor unit
If the outside condenser isn't running, the system can't reject heat. A tripped breaker, a clogged condensate drain, or debris around the unit can all shut it down. Clear the area and reset the breaker once.
Low refrigerant means it's time to call
If everything else checks out, you may be low on refrigerant — which almost always means a leak. That's a job for a licensed tech, since handling refrigerant requires certification and the leak needs sealing first.
Ready to get started?
Every post ends with a call to action that links readers straight back to your website — the part that turns traffic into customers.