Quick Answer
Why is my AC running but not cooling?
An AC that runs but won't cool in Colorado Springs usually has a dirty filter, a clogged outdoor coil, a frozen indoor coil, a failed capacitor, or low refrigerant from a leak. Check the thermostat, filter, and breakers first. If it still blows warm, Strong Heating And Cooling can diagnose it, usually same-day when available.
Reviewed by Jeff Jennings, PPRBD Licensed #26745 — Updated September 2026
Most common causes
- Thermostat set to Fan On, Heat, or the wrong temperature
- Clogged air filter restricting airflow
- Outdoor condenser coil caked with cottonwood, dust, or grass
- Frozen evaporator coil (ice on the indoor coil or refrigerant line)
- Failed capacitor or contactor — the outdoor fan or compressor won't start
- Low refrigerant from a leak (refrigerant doesn't get 'used up')
Safe DIY checks
- Set the thermostat to Cool, fan to Auto, a few degrees below room temperature.
- Replace a dirty filter.
- Check the breaker and the outdoor disconnect switch.
- With power off, gently hose debris off the outdoor coil (no pressure washer).
- If you see ice, turn cooling off and run the fan only for a few hours, then call.
- Make sure the condensate drain or float switch isn't full.
Altitude & Front Range context
Colorado Springs' thin, dry air and strong sun push outdoor units hard on 90° days. A slightly dirty coil or marginal refrigerant charge that would be fine at sea level can leave a home here warm by late afternoon.
When to call a pro
- You smell gas or a burning/electrical odor (leave first if it's gas).
- The problem comes back after the safe checks above.
- Breakers trip again after one reset.
- You hear banging, grinding, or screeching from the equipment.
- Anything involves gas valves, refrigerant, or electrical parts inside the unit.
- The indoor coil or line keeps freezing.
- The outdoor fan isn't spinning while the AC is on.
More questions
Should I keep running my AC if it isn't cooling?
No. If it's blowing warm air or the coil is icing, turn cooling off to protect the compressor. Running the fan only can help thaw ice while you wait for a technician.
Can I just add refrigerant?
Refrigerant isn't consumed — if it's low, there's a leak. Adding refrigerant without finding the leak is a temporary fix, and handling refrigerant legally requires EPA 608 certification.
How long does a furnace or AC install take?
Most straightforward like-for-like furnace or AC replacements in Colorado Springs are completed in a single day. Jobs that need new venting, ductwork changes, or a full system swap can take longer; we give you the timeline with your upfront quote.
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