AC Not Blowing Cold Air

If you're dealing with AC not blowing cold air, this is a common air conditioning problem you’re experiencing. While these units keep us cool and help us push through the summer months, it’s best to ensure these systems are working properly. If not, you could have high energy bills, an uncomfortable home, and an air conditioner that won’t last as long as it should.



Keep reading to learn some troubleshooting tips for an AC unit that doesn't blow cold air.

AC Issues You Can Solve Yourself

While there are some troubleshooting tasks you can try for yourself, others should be left to the professionals. Here are the common AC problems you can work on yourself:

Dirty Air Filters

An AC air filter works to prevent dust, pollen, and other harmful air particles from entering your home. But when these filters become dirty, less air will pass through them. This can lead to poor indoor air quality, a drop in energy efficiency, and a decrease in system longevity. If you’re dealing with AC not blowing cold air, examine these air filters and change them if necessary.

If you have clogged filters, your unit will condition less air. This can result in not feeling cold air coming out of your vents. For instance, while your thermostat may read 75 degrees, the actual temperature may be 80 degrees. With a blocked filter, this limits the amount of air that can be cooled.

Dirty air filters can also lead to a frozen evaporator coil. This component can turn into a block of ice, which can prevent cool air from entering your residence. Make sure to periodically check your air filter and replace it every couple of months. If it’s dirty, you may need to change it sooner.

Changing Thermostat Settings

Luckily, many air conditioner problems can be solved by adjusting the settings on your thermostat. If you’re dealing with AC not blowing cold air, this is a location you’ll want to check thoroughly. 

If your air conditioner sometimes blows cool air and sometimes blows warm air, then your system may be set to “on.” This is when the fan runs continuously, 24/7. This fan will still run even if the air isn’t being conditioned. To only have your AC unit blow air when it’s cool, set your thermostat fan to “auto.”

While you’re adjusting your thermostat, you can also open up the cover and examine the inside. Check for any loose or broken wires, and make sure everything looks normal.

Cleaning the Outdoor Unit



If you’re experiencing AC not blowing cold air, it could be caused by a dirty outdoor unit. As your system’s evaporator, the indoor unit, pulls the heat from inside your home, it will then move that warm air to the outdoors through the condenser. But when this condenser is dirty or covered with leaves or debris, it may struggle to release heat and do its job correctly. This can lead to AC not blowing cold air.

To troubleshoot this, you’ll have to remove the blockage on your outdoor unit. This can be achieved by using your hose to gently spray down your system. Make sure to be careful when doing this, especially when using a pressure washer. You don't want anything to bend inside your unit.

AC Problems the Professionals Should Handle

While there are some troubleshooting tasks you can try yourself, others should be left to the experts. Some of these steps involve dealing with wires and expensive equipment, which poses some safety risks.

If you’re dealing with AC not blowing cold air, here are the troubleshooting tips that should be handled by a professional HVAC technician:

Broken Compressor

Without a properly working compressor, your air conditioner won’t function effectively. This vital component is responsible for transporting refrigerant from your indoor unit to the outdoor unit. If you have a broken compressor, this sometimes means you must replace the entire outdoor system. If you're dealing with AC not blowing cold air, call an HVAC technician to examine your compressor.

Damaged Condenser Fan

A condenser fan is another essential piece of your air conditioning system. Without one of these working properly, your home will have a hard time staying cool. As the goal of this component is to dissipate heat, a broken condenser could be the culprit to your air conditioner problems. If you suspect a broken or faulty condenser fan, call an HVAC professional for assistance.

Low Refrigerant Levels



If your system doesn’t have enough refrigerant, this could be causing your air conditioning problems. While this liquid is essential for absorbing heat and cooling off your home, not having enough could lead to serious system issues. This problem is typically caused by a leak. If you notice any ice on the refrigerant line or hear any bubbling or hissing sounds, a leak could be the issue. If this happens, power off your system right away and call an HVAC technician.

Dealing with AC not blowing cold air? If so, this can be a frustrating problem. Try any of these troubleshooting tips above to boost your comfort and restore the cool air to your home.