Why Is My AC Unit Blowing Out Warm Air?

It’s hot outside, and the last thing you want is for your air conditioner to start blowing out warm air. Unfortunately, this is a common problem that can be caused by several factors. Here are the most common reasons your AC unit might be blowing out warm air.

A Dirty Filter

One of the most common reasons for an AC unit to blow out warm air is a dirty or clogged filter. If the filter is full of dirt and debris, it restricts airflow and forces the unit to work harder than it needs to. As a result, the unit may not be able to cool the air effectively. Here in South Louisiana, where we run our systems nearly year-round, filters clog up faster than you might expect.

Low Refrigerant

Another common reason for an AC unit to blow out warm air is a low refrigerant level. If the unit is low on refrigerant, it will be unable to cool the air properly, causing it to blow out air that is tepid.

A Faulty Thermostat

Another potential cause of an AC unit blowing out warm air is a faulty thermostat. If the thermostat isn’t working properly, it may not be able to accurately gauge the temperature inside your home, and this could cause the AC unit to turn on or off at the wrong time. As a result, your home may not be cooled as efficiently as it should be.

Leaking Ducts

Another possible cause of an AC unit blowing out warm air is leaking ducts. If the ducts that carry cool air throughout your home are leaking, they can allow warm air to enter the system, resulting in the AC unit blowing out warm air.

If your AC unit is blowing out warm air, it’s best to call in a professional for an inspection. In nearly 70 years of HVAC work across Acadiana, we’ve seen every one of these issues (and a few you wouldn’t believe). If your system is blowing warm air and you can’t pin down the cause, call F & R Air Conditioning at (337) 893-5646 and we’ll get it diagnosed fast.