If you’ve ever spent a hot summer plagued with air conditioner problems, it’s certainly an experience that you don’t want to repeat. Here are a few common problems and how to prevent them. Number one is low refrigerant. The refrigerant is what the air conditioner uses to remove heat and humidity. If a system develops a leak in the refrigerant lines, you’ve got problems. An HVAC technician is needed to repair the leak(s) and restore the amount of refrigerant required. Number two is a frozen evaporator coil, which is what stores the refrigerant. These coils need warm air circulating around them to keep working properly. When something goes wrong with the airflow, a layer of ice can build up on the outside of the coil. The outside condenser unit is where the evaporator coils are located. If a layer of dirt and debris cover the coils, its operation is impeded, which means it has to work harder. This can lead to a system failure, which is problem number three. Number four is a problem with the fans, which blow indoor air over the evaporator coil to cool the air and blow absorbed hot air outside of the building. A faulty motor, a lack of lubrication, worn belts, or too much dirt and debris can cause the compressor to fail. The ductwork that runs through your walls and ceiling carry the cooled air throughout the house. The fifth problem involves holes or leaks in the ducts, which can be caused by careless installation or rodents. Number six is a miscalibration on a thermostat. This problem is fairly easy to fix by either recalibrating or replacing the thermostat. Each one of these problems can be prevented with regular maintenance from a certified HVAC contractor.