Apex Troubleshooting Guide

Why Is My AC Running But Not Cooling?

The most common reasons an Apex AC blows warm air — what you can safely check yourself, and when to call.

Quick Answer

An AC that runs but does not cool is most often caused by a dirty air filter, a tripped breaker, a frozen evaporator coil, low refrigerant, or a failed capacitor. Start with the filter and thermostat; if those are fine, it usually needs a technician.

Check these first (safe DIY)

Before you call anyone, run through the quick, safe checks below — sometimes it is a five-minute fix. In Apex, where afternoons regularly top 95°F, a no-cool problem is worth acting on quickly.

1
Check the thermostat. Make sure it is set to COOL and below the current room temp. Try fresh batteries.
2
Replace the air filter. A clogged filter chokes airflow and can freeze the coil. Swap it if dirty — this is the #1 cause.
3
Check the breaker. A tripped breaker or a full condensate float switch can leave the outdoor unit off. Reset once — if it trips again, stop and call.
4
Look at the outdoor unit. Clear debris from the condenser. If it is iced over, turn cooling off and the fan on to let it thaw.
5
Call a pro if it is still warm. If none of the above fixes it, you likely have low refrigerant, a failed capacitor, or a compressor issue — technician territory.

When it is time to call

If you smell burning, the breaker keeps tripping, or water is pouring from the air handler, shut the system off and call — those are not wait-until-tomorrow problems in an Apex summer. We dispatch a senior tech within a 2-hour window, and emergency service carries the same flat pricing with no after-hours surcharge.

Want a senior tech to just handle it?

Written quote before any work, 2-hour response across Apex, flat pricing. No upsell pressure.

Frequently Asked

Why is my AC blowing warm air but still running?+
Usually low refrigerant, a failed capacitor, or a compressor problem — the system cycles but cannot cool. A dirty filter or frozen coil can also cause it.
Should I turn my AC off if it is not cooling?+
Yes — running an AC that is not cooling can freeze the coil or damage the compressor. Turn it off, set the fan to on to help any ice thaw, and call.
How fast can you come out in Apex?+
A senior tech is dispatched within a 2-hour window during business hours, out of our Cary headquarters on NW Maynard Road.
BEFORE YOU GO
$50 OFF
your HVAC repair

A senior tech, a 2-hour arrival window, and a written quote before any work starts.

or call (919) 335-9030

One offer per visit. Not combinable with other discounts. Repairs only.