Air Conditioner Blowing Warm Air? Diagnosis Tips!

When you come home from a long day, stuck in the sun and the heat – the last thing you want to come home to is your air conditioner blowing warm air! However, you may be able to fix this yourself at home! Here’s how:

Diagnosing an Issue with your Airflow

Too little air flowing through your system causes a number of problems, including reduced cooling. Debris build-up is the most common cause of poor airflow. First, check your air filter for debris, and replace it if it’s dirty! A clean filter will automatically improve airflow.

Next, inspect your outdoor unit for a buildup of grass clippings or other debris on the exterior fins. You can clean the fins with a soft brush to remove any debris built up. The unit should also be professionally cleaned by an HVAC technician during your annual air conditioning tune-up. (This is often required by you’re A/C manufacturer to keep your warranty active.)

A layer of dust on the indoor evaporator coil interferes with your A/C’s cooling ability, potentially making it seem the system is blowing warm air. If you’re not comfortable cleaning this component yourself (most people aren’t, and that’s OK), contact us online to schedule a tune-up (and for a limited time, receive a FREE dryer vent cleaning while we’re there!)


Diagnosing Technical Problems

Check the outdoor condenser unit to make sure the power switch wasn’t turned off and the plug wasn’t pulled out. When the outdoor unit doesn’t get power, the indoor fan will run, but the system won’t cool the air. If you have a heat pump, check your thermostat settings to make sure your system is set to “cool” and wasn’t accidentally switched to “heat” mode or “fan”, depending on your thermostat’s settings. (A smart thermostat could help in this situation! Contact us online if you’re in need of an upgrade!)

If your air conditioner is blowing hot air, the system has been steadily losing cooling capacity (taking longer to cool your house), and you find ice on your indoor unit’s copper refrigerant lines, you could have a refrigerant leak. Leaks are typically caused by an installation error, sometimes by deterioration in the lines or by damage. Because refrigerant is toxic, please call us immediately to determine if you have a refrigerant leak, if you are concerned that you do. We’d never suggest doing this step on your own!

Troubleshooting at home can simply help you save money and be more efficient! However, if there’s ever an HVAC or electrical task that you cannot handle, America’s Best Mechanical & Electrical is always here for you. We have 24/7 emergency service available! Visit us on Facebook to see our current discounts, promotions and coupons – as well as to share your experience with America’s Best with your friends! We’d love the opportunity to show you and your friends what we can do! You can also receive referral incentives!

America's Best Mechanical & Electrical Contracting