Troubleshooting Tips for an Underperforming Air Conditioner

Is your air conditioner running but not cooling your home effectively? Before calling a professional, there are several things you can check to potentially resolve the issue on your own. From simple fixes like adjusting the thermostat to more complex problems that might require replacing components, here are some common reasons your AC might not be lowering the temperature and what you can do about them.

Thermostat Settings

First, check your thermostat. Ensure it is set to “cool” and that the temperature setting hasn’t been changed inadvertently. If the thermostat is off, set to “heat,” or set for constant fan (often labeled “on”), switch it back to cooling mode. After making adjustments, wait a few minutes to see if cold air starts blowing from the registers. If not, proceed to the next step.

Dirty Air Filter

A dirty air filter can significantly impede your AC’s performance. Locate the air filter in or around the indoor air handler unit, turn off the system, and remove the filter. If it’s dirty, replace it with a new one. A clean filter improves airflow and helps the system run more efficiently. If your system still isn’t cooling after replacing the filter, it’s time to inspect the condenser unit.

Blocked Condenser Unit

The outdoor condenser unit can become blocked with dirt, grass, and other debris, reducing its efficiency. Check the exterior coil, which is covered with thin metal fins. Clear away any debris by carefully vacuuming with a brush attachment or rinsing gently with a hose. Ensure that the area around the unit is clear to maintain good airflow. If cleaning the coil doesn’t help, further investigation is needed.

Damaged Heat Pump

If your outdoor unit is a heat pump, it functions like a condenser unit but also heats your home. The heat pump can suffer from similar issues, such as dirty coils, refrigerant leaks, or compressor malfunctions. Check the thermostat settings, air filter, and condenser unit. If everything seems fine but the system still isn’t cooling, it’s time to call a professional.

Frozen Evaporator Coil

The evaporator coil, located in the indoor unit, can freeze and hinder the cooling process. Signs of a frozen coil include frost on the copper refrigerant tubing, inadequate cooling, higher utility bills, and excessive condensate drainage. Resolving this issue often requires professional assistance due to the difficulty of accessing the coil.

Refrigerant Leak

Refrigerant is essential for cooling. A leak can cause your AC to run longer without effectively cooling your home and may eventually damage the compressor. Identifying and fixing refrigerant leaks is a job for an HVAC professional, as it involves handling chemical refrigerants and ensuring proper system pressure.

Undersized Air Conditioner

An undersized air conditioner may struggle to cool your home, especially during extreme heat. If your system runs constantly but fails to maintain a comfortable temperature, it might be too small for your space. An HVAC professional can assess your home and recommend whether adding a ductless unit or replacing the system with one of the correct size is the best solution.

If these troubleshooting steps don’t resolve the issue, it’s best to consult with the experts at Brothers HVAC. We can provide a comprehensive assessment and professional service to get your air conditioner back to optimal performance. Stay cool and comfortable with our reliable HVAC solutions.