The Top Reasons Why HVAC Systems Blow Warm Air in Cooling Mode

You understandably expect your heat pump or air conditioner to blow cool air when set to cooling mode. However, instances may occur when it does the exact opposite. There are a variety of explanations for what could be happening to your HVAC system, and Cafco Services, one of the top HVAC installation companies in the local area, discusses each one below.

The Settings on Your Thermostat

Once you notice this problem, the first thing you should do is check the thermostat. Sometimes, even when summer is in full swing  homeowners forget to turn the thermostat from warm to cool. Stick up a post-it note or put a notification on your mobile phone that will remind you to turn the thermostat to cooling mode well before the start of the summer season. In addition to cooling mode, see to it that the fan is set to “auto” and the set temperature is below the current temperature reading.

Dirty Air Filters

If you’ve adjusted the thermostat yet the heat pump or air conditioner unit is still blowing warm air, take a look at the air filter. It may have been several months since you last cleaned or changed it. Air filters filled with dirt and debris don’t allow for proper airflow. By themselves they won’t cause warm air to blow, but they will  contribute to the issue and affect the HVAC system’s health and performance significantly. Heating and air conditioner maintenance companies recommend changing filters every three months.

Refrigerant Leaks

If warm air is still blowing even after you’ve performed the basic troubleshooting tips mentioned above, the problem might be with one of the unit’s interior components. Leaking refrigerant is something to watch out for because it means that there’s a worn-out joint or that rust has accumulated on the evaporator coil. When this happens, the unit starts losing its effectiveness at blowing cool air. Call a local HVAC technician who can do a thorough inspection of your heat pump or AC unit and definitively determine the source of the leak.

Frozen Outdoor Unit

Cooling occurs due to evaporation on the coils. However, because of problems like blocked air filters and low refrigerant pressure, condensation can build up on the coils, causing them to freeze. This happens when the temperature at which the unit is trying to blow falls below the freezing point of water. Never set your thermostat to the lowest temperature setting. Also, turn off the unit and let it thaw for at least two or three hours before turning it back on when this happens. If the problem persists, call your HVAC technician.

Worn-Out Compressor

The compressor plays a vital role in keeping your home comfortable. Cooling occurs when it takes the refrigerant from the evaporator coil and converts it into a high-pressure gas, which then flows to the condenser coils. If the compressor fails, the entire HVAC unit won’t be able to function effectively. Refrigerant issues, electrical failures and overheating are some of the reasons why this happens. Your local HVAC technician can either  recommend replacing the worn-out compressor or the outdoor unit itself.

Blown Breaker Switch

Some HVAC units draw more electrical power on starting up. However, if they’re not designed to handle that amount of current, the breakers of both the indoor and outdoor units will switch off automatically. This is a safety precaution to protect them from breaking down suddenly. If this happens, simply flip the breakers back to the “on” position. If you’re going to install a new heat pump or AC unit, make sure that its breakers can handle the current.

Turn to Cafco Services for your HVAC repair, replacement and installation needs. We offer fast, efficient service and accurate diagnoses to help eliminate the potential for callback and additional costs. You can even take advantage of our preventative maintenance program to ensure the smooth and efficient operation of your HVAC unit no matter the time of year.

Get started by calling (513) 242-3400 or fill out our contact form to schedule your service.