Why Is My AC Blowing Warm Air?

May 1, 2022 | Cooling

If you have an air conditioner, one of the most common problems that can occur is the unit blowing warm air when it should be cold. Unfortunately, it isn’t always the same culprit causing the problem. We’ve listed below some of the causes and how to troubleshoot them.


When someone is having trouble with their air conditioner, it could be because the thermostat is set on “heat”. Check again to ensure it’s set on “cool”. If this is the case, simply flip it back to the other setting and wait to see if it begins to blow cool air. Using the “on” setting has the fan running constantly even if the air conditioner is off. We recommend using the “auto” function and only switching when necessary.

Condenser Unit

Your outdoor and indoor units work in unison to remove heat from your home. Just like the indoor unit needs space to operate properly, so does the outdoor unit. Removing any dirt and debris from in/around the unit can drastically improve performance. Remember to schedule professional maintenance at the beginning of each season to prevent unexpected issues.

Circuit Breaker

A blown fuse or tripped circuit breaker could be the root of the problem. HVAC systems require a lot of power. As a safety precaution, the circuit breaker might have accidentally cut off power automatically after detecting too much demand. To turn the power back on the breaker, simply flip the switch to “off”, then back to the “on” position. If there is a blown fuse, it will need to be replaced.


The single most common cause behind hot air being blown by air conditioners is low refrigerant. Refrigerant is very dangerous and is responsible for pulling the heat out of your home’s air. The main tell behind refrigerant issues is ice forming on your air conditioner. If you do notice your unit hissing or ice forming, do not wait to act. The faster you respond to the issue, the better. Contacting a professional as soon as possible is your best option.

Calling and scheduling a service appointment before the start of the season or as soon as you see a problem occur, is the best way to keep your unit running properly. We know that a broken-down air conditioner can be a stressful time, especially during the summer heat. We take the worry out of the service call, by carefully diagnosing and thoroughly explaining your repair options, step-by-step.

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