Why is my AC blowing warm air in Spanish Fork?

Why an AC blows warm air in summer

If you're searching "why is my AC blowing warm air," start with the simple causes. A wrong thermostat setting, a clogged filter or a blocked outdoor unit can all do it.

Sometimes the cause is inside the system, such as low refrigerant or a worn compressor. Those faults need a licensed contractor, and the sections that follow show how to tell the two groups apart.

What should I check first at the thermostat and filter?

Start inside the house. These checks are safe for any homeowner, and none of them needs a tool beyond a screwdriver for the battery cover.

• Set the thermostat to cool, with the target below the current room temperature.
• Switch the fan to Auto. The On setting runs the fan between cooling cycles and can push out warm air.
• Replace the thermostat batteries if the screen is dim or blank.
• Pull the air filter and hold it up to a light. If you can't see light through it, replace it.
• Check that supply vents and return grilles are open and not blocked by furniture or rugs.

If every check passes and the air is still warm, move on to the outdoor unit. The AC repair page for Spanish Fork also explains how the phone line works if you'd rather not keep troubleshooting.

Could the outdoor unit or the breaker be the cause?

Yes. The outdoor unit moves heat out of your house. If air can't reach it, or it has lost power, the air inside stays warm.

Walk outside and look at it. Clear leaves, weeds and grass clippings from the sides and top, and keep shrubs and fences back so air can flow around it. Then see whether the fan on top is spinning.

The NOAA weather station near Spanish Fork averages 60 days a year with a high of 90°F or more. On days like that, an outdoor unit crowded by plants or a fence has a harder time shedding heat, so clear space around it matters.

Next, check the breaker panel. If the AC breaker has tripped, switch it fully off, then back on, one time. If it trips again, stop. A breaker that keeps tripping points to an electrical fault, and resetting it over and over only adds risk.

Which warm-air problems need a licensed contractor?

Low refrigerant, a failing compressor and bad electrical parts all need a licensed contractor. These parts are sealed or live, and a homeowner should not open them.

Refrigerant is the fluid that carries heat out of the house. It isn't used up like fuel, so a low level usually means a leak.

Signs that point to this kind of fault:

• The air was cool, then turned weak and warm over several days.
• You hear hissing or bubbling near the indoor unit or the lines.
• The outdoor fan spins but the air from the vents stays warm.
• The outdoor unit hums or buzzes without starting.
• The breaker trips every time the AC runs.

If ice shows on the refrigerant lines, switch the AC off and let it thaw. The guide on ice on the AC lines and water at the indoor unit covers what to switch off and check.

Some things are never a homeowner job. Don't add refrigerant, open the electrical panel on the unit, touch wiring or capacitors, or pry at sealed parts. A licensed contractor checks the wiring and handles the refrigerant.

What does a licensed contractor do about warm air?

A licensed contractor works from the easy causes toward the harder ones. The thermostat signal and airflow come first, since they are the simplest causes to rule out.

After that, the contractor looks at the coils, the refrigerant level, the electrical parts and the compressor. A dirty coil may only need cleaning. A leak needs to be found and repaired. A failed part gets replaced.

It helps to note a few things before you call: when the air turned warm, whether the outdoor fan runs, whether you saw ice, and what you already checked. Ask the contractor what was found and whether the job needs a permit.

Is it okay to keep running a warm AC?

It's better to switch the system off than to keep it running without cooling. A unit that runs but doesn't cool can freeze up, and it can strain the compressor.

You can use the fans in the house while the AC is off. Keep blinds closed on sunny windows to hold the heat down.

To prevent the problem, check the filter on a regular schedule, keep the outdoor unit clear of debris and notice early when the air from the vents stops feeling as cool as it used to.

Next step: the AC repair phone line

If the checks don't bring cool air back, the next step is the phone line. Where a contractor is available, the line connects the call to a licensed, insured contractor, who then confirms availability and fees.

You can read how that works on the AC repair in Spanish Fork page.