An AC not blowing cold air can quickly make your home uncomfortable, especially during periods of extreme summer heat. There are several possible reasons an AC may be running but not cooling properly. They range from restricted airflow and dirty coils to refrigerant problems or failing mechanical components. Some issues may have simple solutions, while others can strain your cooling system and lead to more serious damage if ignored. Understanding the common warning signs can help homeowners identify potential problems early and determine when it is time to contact an HVAC professional for repairs.
Simple Checks to Try Before Calling a Professional
Check the thermostat. Sometimes, a person just bumped the setting from “Cool” to “Fan Only.” This will cause the system to blow air without cooling. Flipping the switch to the right position should resolve the problem.
A dirty air filter can also cause problems. Even if you’re following the standard replacement schedule, a filter might be clogging faster than expected. You should replace your HVAC filter at least every 1-3 months. Many homeowners inspect their filters once a month to ensure they know when it is time for a fresh one.
Check whether the outdoor coils are dirty. Dirt reduces heat transfer, making it harder for your AC to cool your home. If they are coated with debris, an HVAC technician will gently clean the fins and coils to avoid damage. Our technicians perform this service as part of regular AC maintenance.
Look around the outdoor unit for blockages, too. Your condenser should have at least 2 feet of clearance on all sides for proper airflow. You may have to trim back branches or bushes a few times a summer. Also, clear any debris from the vents in the metal housing that protects your outdoor unit.
Problems That Require a Professional’s Help
If those solutions don’t work, it’s likely your cooling system has developed a mechanical problem. Our technicians will arrive in a fully stocked company vehicle ready to work. We can complete most repairs in a single visit.
Low Refrigerant
Low refrigerant is a common reason for an AC not blowing cold air. Refrigerant handles the heat transfer from inside your house to the outdoors. Lines can be damaged, or seals can fail, leading to refrigerant leaks. Our technicians will pinpoint the leak and perform repairs. They will then recharge your system to restore proper cooling.
Failed Capacitor
Your AC unit uses a capacitor to store enough electricity to start each cycle. If the capacitor fails, the AC simply won’t have enough power to kick on. The system may hum, click, and then shut off. Also, it might blow weakly cooled air.
The capacitor stores live voltage when the AC is off. It’s dangerous enough to seriously injure a person. Fixing a failed capacitor is a job for one of our HVAC technicians.
Failed Compressor
The compressor pressurizes the refrigerant, allowing it to store and then release heat. If your compressor is malfunctioning, your AC will do little to no cooling. A failed compressor can get noisy, leading to clanging or grinding in the outside unit. It may even trip the circuit breaker for the AC.
A failed compressor can be an expensive fix. In many cases, the price exceeds half the cost of a replacement AC. You should consider replacing the entire AC in this scenario, unless it’s still under warranty.
Failing Blower Motor
Your blower motor pushes the cooled air through your home’s ductwork. Blower motors can wear out, leaving your AC running but not cooling.
A failed blower motor often causes the coils to freeze. This may appear to be a freezing issue, but diagnostics often point to the motor as the cause. Also, the symptoms can be very similar to a clogged filter. In some cases, you may notice burning smells from the vents. If this is the case, turn the system off and contact us.
Contact Your Local Cooling Experts
At Appalachian Heating & Air Conditioning, we employ licensed and trained technicians who tackle all kinds of HVAC work for both residential and commercial customers. Your friends and neighbors have trusted us with their HVAC needs since 2004.
Contact Appalachian Heating & Air Conditioning if your AC is not blowing cold air for a thorough diagnostic and repair in Martinsburg, WV.
