If your outdoor AC unit is blowing cooler air outside and only fan-temperature air inside when set to the cool setting, there could be several potential reasons for this issue. Here are some common causes:
Refrigerant Leak: A refrigerant leak can result in insufficient cooling capacity, causing the outdoor unit to blow warmer air. Meanwhile, the indoor unit may still operate the fan, which circulates the indoor air without cooling it significantly.
Frozen Evaporator Coil: If the evaporator coil inside the indoor unit becomes frozen due to low refrigerant levels or restricted airflow, it won't be able to absorb heat from the indoor air effectively. As a result, the air blown into your home will be at fan-temperature instead of being cooled.
Airflow Issues: Restricted airflow can be caused by clogged air filters, blocked vents, or problems with the blower motor. Reduced airflow can lead to a lack of cooling indoors despite the outdoor unit running.
Thermostat Settings: Double-check that your thermostat is set to "cool" mode and the temperature is set lower than the current room temperature. Sometimes, incorrect thermostat settings can cause this issue.
Compressor Problems: Issues with the outdoor unit's compressor can also lead to reduced cooling capacity, resulting in warm air being blown inside and cooler air being expelled outside.
Electrical Problems: Faulty electrical connections or components can disrupt the proper functioning of the AC system, affecting its cooling performance.
Dirty Outdoor Unit: If the outdoor unit's condenser coils are covered in dirt and debris, it will struggle to release heat efficiently, leading to reduced cooling capabilities.
To resolve the issue, you should consider calling a professional HVAC technician to inspect and diagnose the problem accurately. Attempting to fix complex AC issues without the proper knowledge and tools can lead to further damage or safety hazards. The technician will be able to identify the root cause of the problem and perform the necessary repairs or maintenance to restore your AC system's cooling performance.