air conditioner blowing warm air

Why Your Air Conditioner is Blowing Warm Air

Is it hot inside or is it just your air conditioner blowing warm air?

When your AC is not doing its job it can be frustrating, to say the least. If your air conditioner is blowing warm air, it could mean that there is a larger issue within your system, or it could be a simple problem that requires a few steps to fix. If you are experiencing issues that are not being solved by checking a few simple things, consult a professional to get your unit checked out ASAP.

Easy Fixes


This seems like a no-brainer, but some homeowners (or their kids) forget to change their thermostats from “warm” to “cool”. Also, be sure your fan setting is changed to “auto” rather than manual- as it could not turn on if you forget to adjust the fan throughout the day. It is easy for kids to fidget with the thermostat and not realize that they have changed the settings (and maybe adults too).

Dirty Air Filters

Another possible issue that is an easy fix is a dirty air filter in your HVAC system. In Arizona, you should be checking your air filter at least once every 1-2 months. A plug-up of dirt and debris could prevent proper airflow, which is an easy replacement or cleaning.

A Blown Breaker Switch

External AC units could have been turned off by its power switch in response to a bad breaker. This happens when it senses a power overload to protect itself and can be solved by simply checking if it is off and switching it on. If this has happened to your unit- contact an electrician and HVAC Company to make sure your breaker will be able to withstand the power moving forward.

Not So Easy Fixes


Your compressor could fail because of electrical, overheating, or refrigerant running back in. Compressors generally last about 10-20 years, and a failure will result in your entire unit failing to operate. This type of issue doesn’t happen often but is pricey when it does. You need to call a professional to either repair or replace your compressor as soon as possible.


Whether it’s your compressor or any other part of your AC unit, there are hundreds of wires that all contribute to the electrical performance of your system. If one wire is burnt or frayed it could lead to partial and complete failure. Most often these wires are damaged by pets or weather if they are left exposed. Prevent this by ensuring all wiring is covered and tucked away.

Leaking Air Ducts

If your air ducts are not properly secured or if there is some sort of tear, the cool air will not circulate properly throughout your home. Since these are hidden in attics, walls, or basements you will have to call an HVAC professional to determine if this is the case safely.

Low Refrigerant

A refrigerant leak is a very common culprit for blowing warm air. AC units don’t use refrigerant like a car uses gas, so a low level most likely means you have a leak somewhere in your unit. Unfortunately, you would need to call a professional to asses and fix this issue.

If your AC unit is blowing air, you can do the routine checks to see if it is an easy fix but you aren’t guaranteed to find the exact cause of the issue. We recommend calling a professional who will accurately assess the issue and provide an effective solution.