White ceiling supply vent in bright summer light

AC blowing warm air · Pueblo, CO

Air conditioner blowing warm air

Air is moving but it isn’t cold, which usually means the outdoor half of the system has stopped doing its job. We can find out why — call any time.

Call (719) 670-8043 Go look at the outdoor unit

24/7 · Licensed & insured · Pueblo & Pueblo West

Answering calls 24/7
Licensed & insured technicians
Pueblo & Pueblo West, ZIPs 81001–81012

Go outside and listen

With the thermostat calling for cooling, walk out to the condenser — the metal box with the fan on top. What it’s doing narrows things down fast.

What you notice	What it usually points to
Completely silent	No power reaching it: the disconnect is pulled or switched off, the breaker has tripped, or the contactor isn’t closing. A thermostat or low-voltage wiring fault can do it too.
Humming, fan not turning	A failed run capacitor or fan motor. Turn the system off — running like this can burn out the compressor.
Fan spins, no change in sound, air still warm	The compressor may not be running, or the system may be low on refrigerant from a leak.
Running normally, warm air inside	A heat pump stuck in heating, or a refrigerant or indoor-coil problem.

Don’t take the access panel off. The capacitor inside stores enough charge to hurt you even with the power off.

The quick checks

Thermostat on Cool, not Heat or Fan. “Fan On” blows air all the time whether or not the system is cooling. Set it to Auto.
Breaker. Reset a tripped AC breaker one time. A second trip means stop and call.
Outdoor disconnect. Make sure it’s on and the pull-out block is in place.
Wait five minutes. Many thermostats hold the compressor off for 3–5 minutes after a change.

What we usually find

On a warm-air call the usual suspects are small electrical parts and refrigerant problems. The technician tests each one rather than guessing:

Capacitor — helps start the compressor and fan motors; a common failure.
Contactor — the switch that sends power to the outdoor unit; arcing pits its contacts, and insects or debris can jam it.
Refrigerant leak — the system is low, the coil can’t absorb heat, and the air comes out lukewarm.
Compressor — the expensive one. If it’s the compressor, we’ll talk about whether replacement makes more sense, especially on an older or R-22 system.

Typical U.S. range for a capacitor repair: $100–$250, per Angi, October 2026 — a national figure, not a Pueblo quote. Your exact price comes after diagnosis.

With weeks of 90-degree days in a typical Pueblo summer — 89 of them in 2024 — these parts work hard. When one fails mid-July, the house heats up quickly.

Someone feeling sick from the heat? Health first, AC second.

If anyone in the house is elderly, ill, very young, or showing signs of heat illness, don’t wait on a repair. Get them somewhere cool now: an air-conditioned home of family or friends, or an air-conditioned public building.

Call 911 for signs of heat stroke: a body temperature of 103°F or higher; hot, red, dry or damp skin; a fast, strong pulse; confusion; or passing out. While you wait, move the person somewhere cooler and cool them with wet cloths or a cool bath. Don’t give them anything to drink.

Heavy sweating, cold and clammy skin, a fast but weak pulse, nausea, cramps or dizziness point to heat exhaustion. Move to a cool place, loosen clothing and sip water, and get medical help if they vomit, get worse, or aren’t better within an hour.

Questions we hear

The indoor fan runs but the outdoor unit is silent. What does that mean?

The house side is getting power and a call for cooling, but the outdoor unit — the part that actually removes heat — isn’t starting. Common causes are a pulled outdoor disconnect, a tripped breaker, a failed contactor or capacitor, or a thermostat wiring problem. Check the breaker and disconnect once; beyond that it’s a job for a technician.

I have a heat pump. Could it be stuck in heating?

It could. A heat pump uses a reversing valve to switch between heating and cooling, and if that valve sticks or its solenoid fails, you get warm air on a hot day. First confirm the thermostat is set to Cool — after a chilly spring night someone may have switched it to Heat. Our heat pump cooling page has more.

Could a dirty filter cause warm air?

Indirectly, yes. A badly clogged filter starves the indoor coil of airflow until it freezes over, and a frozen coil can’t cool the air passing through it. If you see frost on the copper lines, turn cooling off and read our frozen coil page before anything else.