As the temperatures heat up, the chances of your air conditioner breaking down increase significantly. Unfortunately, it can still come as a nasty surprise when you turn on the AC, and no air comes out. While this can be very frustrating, there is often a simple reason for a lack of cool air and with a little know-how, you could avoid the need to call in a professional HVAC technician.
The Primary Cause of No Cool Air:
The most common reason for an air conditioner running but not emitting cold air is that the condenser coil has frozen. The coil is located in the outdoor air conditioning unit, and it usually freezes up because of some form of blockage compromising the airflow. A fully functioning AC unit cools the air by passing air over the coil filled with refrigerant. Just like the glass in your windows on a cold day, this process can also produce condensation. A central AC system can produce as much as 20 gallons of condensation each day. When the airflow of the system is compromised, this water builds up on the coil and can be frozen. As more and more water builds up and freezes, eventually the coil will freeze into a solid block of ice.
DIY Methods to Resolve the Issue:
Before you get on the phone to your HVAC company, there are several DIY methods that can resolve a frozen coil. The first step you need to take is to turn off your unit. You won’t be able to do anything until the ice has the chance to melt. This could take as much as 24 hours. Once the coil has defrosted, you can try a couple of things to see if you can correct the issue, before calling in the professionals.
The easiest troubleshooting method is to clean or change the air filters in your AC system. A clean filter not only improves air quality and saves energy, but it drastically improves airflow throughout the system. Regular filter replacement can contribute to an improved cooling performance and a prolonged lifespan of your system. Most AC manufacturers recommend that filters are cleaned or changed at least every two to three months. The specific timeframe for your system will be detailed in your owner’s manual. If you have pets or smokers in the house, you may need to change filters more frequently.
It is also a good idea to check the condition of your outdoor unit. This unit can often become clogged with vines, leaves, weeds and other yard debris. Debris can easily clog the unit and cause problems. Ideally, there should be a clear area of at least two feet around all sides of your outdoor unit. If possible, trim back any landscaping to improve air circulation.
Finally, check that all vents in your home are clear and free of obstructions. This will improve airflow and allow more consistent cooling. Check that pieces of furniture have not been placed too close to a vent and that there is no debris or dust clogging up the system.