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Why Is My AC Blowing Hot Air?

Is your air conditioner blowing hot air instead of cooling your home? This frustrating issue can have several causes, some of which you might be able to fix yourself. For instance, a clogged air filter is a common culprit that’s easy to handle on your own. But, other problems might require the expertise of an experienced HVAC technician.

To get to the bottom of the issue, start by checking the following:

While many of these checks are straightforward, some issues, especially those involving refrigerant or the compressor, definitely require professional skills. If your initial troubleshooting doesn’t solve the problem, it’s time to call in the experts.

Need help with an air conditioner blowing hot air?

If your AC is blowing hot air, let the highly-trained technicians at Cooper Heating and Cooling diagnose and resolve the issue quickly and effectively. You can count on our experts for honest advice and precise AC repairs. We promise to recommend only the necessary services, ensuring you never pay for more than what’s needed for routine maintenance.

Obstructed Air Flow

The air moving freely through your home is what keeps it cool. When air can’t move without obstruction, it’s harder for your AC unit to keep your home at the desired temperature. Several things can impact airflow. However, it’s often the case that something is blocking the vents.

To remedy this, start by checking all the vents in your home. Make sure they aren’t blocked by curtains or furniture, for example. You might also want to schedule a visit from an HVAC pro to have ducts thoroughly cleaned every few years.

Dirty Air Filters

Regularly changing your air filter is crucial for maintaining efficient airflow through your AC unit. Most manufacturers recommend replacing the filter monthly. Failing to do so can lead to the filter becoming clogged with dirt and debris. This blockage restricts airflow, potentially causing the evaporator coil to freeze and diminishing the unit’s ability to cool the air effectively. As a result, you might experience your system blowing hot air instead of cooling your space.

The Outdoor Unit Needs Cleaning

Keeping your indoor air handler clean is pretty straightforward. However, it’s easy to overlook the outdoor condensing unit and housing, even though it plays a critical role in keeping your house cool. If leaves or other debris prevent the condenser fan from removing the hot air from your home, it can dramatically limit cooling efficiency. Inspect the outdoor unit regularly and clean it as needed to remove any accumulation of debris or dirt. It’s also a good idea to keep the area around it clear for proper airflow.

Incorrect Thermostat Settings

Before calling in for an AC blowing hot air, take a few minutes to check the thermostat. If the unit is switched to heat,” it doesn’t matter how low the temperature setting is — the air blowing from the vents will likely feel warm. If the thermostat isn’t set correctly, adjust it and give the system time to cool the air to the desired temperature. You will also want to make sure you check your scheduled setting to make sure the unit is programmed correctly for the season you are in.

Low Refrigerant Levels

Refrigerant is essential for cooling the air within your AC system. When levels are low, the system struggles to cool your home efficiently. This can lead to the AC running longer than usual, increasing your electricity bills, and failing to maintain a consistent temperature throughout your home. A common sign that your AC is running but not effectively cooling is exactly this scenario — low refrigerant levels.

If you suspect that your system is low on refrigerant, it’s important to call a professional HVAC technician. Handling refrigerant requires special licensing due to environmental regulations and the technical skills needed to safely charge an AC system.

Faulty Compressor

A serious problem that can result in your AC blowing warm air is a faulty compressor. If you suspect you have a faulty compressor, it’s crucial to contact a professional HVAC technician for diagnosis and repair. If this is the case, it may also be time to consider replacing your air conditioner if it’s reaching the end of its usable life.

Act quickly when your AC is blowing warm air!

Contact Cooper Heating and Cooling for fast and reliable scheduling for your next AC maintenance or repair visit. With over 45 years in business, we know how to handle every make and model.