If your outdoor AC unit is blowing cooler air outside but the indoor unit is blowing warm or fan-temperature air when set to the cool setting, there may be several possible reasons for this issue:
Refrigerant leak: One common cause could be a refrigerant leak in the AC system. Refrigerant is responsible for absorbing heat from the indoor air and transferring it to the outdoor unit to be released. If there is a leak in the refrigerant lines, the system may not have enough refrigerant to properly cool the indoor air, resulting in insufficient cooling performance.
Clogged air filters: Dirty or clogged air filters can restrict airflow and hinder the cooling process. When the airflow is restricted, the indoor unit may struggle to cool the air effectively, leading to warmer air blowing out of the vents. Regularly cleaning or replacing the air filters can help ensure proper airflow and cooling efficiency.
Blocked or closed vents: Check that all the vents in your home are open and not obstructed by furniture, curtains, or other objects. Closed or blocked vents can impede the airflow, preventing the cool air from reaching the rooms effectively.
Faulty thermostat: A malfunctioning thermostat can misread the temperature or fail to signal the AC unit to cool properly. This can result in the AC system not running at its intended capacity and blowing air that is not as cool as desired. Consider checking the thermostat settings and ensuring it is functioning correctly.
Improper AC sizing: If the AC unit is not sized appropriately for the space it is intended to cool, it may struggle to achieve the desired cooling capacity. An undersized AC unit may run continuously but still fail to cool the indoor air adequately. Consulting with an HVAC professional to assess the AC unit's sizing in relation to your space may be necessary.
Issues with the outdoor unit: Problems with the outdoor unit, such as a malfunctioning compressor or condenser fan, can impact the overall cooling performance of the AC system. If the outdoor unit is not functioning correctly, it may not be able to transfer heat effectively, leading to reduced cooling capacity.
It is recommended to contact a qualified HVAC technician to diagnose and resolve the issue. They will be able to assess your AC system, identify the specific cause of the problem, and perform any necessary repairs or adjustments to restore proper cooling performance.