An air conditioner that is not cooling can be frustrating, especially during the hot summer. However, before calling a professional for repairs, there are several things you can check to try and resolve the issue on your own.

Here are some of the most common reasons why an air conditioner may not be cooling:

Dirty Air Filters: Dirty air filters can cause airflow problems and prevent the air conditioner from cooling effectively. Clean or replace the air filters as necessary.

Thermostat Issues: If the thermostat is not working correctly, it can prevent the air conditioner from cooling. Ensure that the thermostat is set to "cool" and that the temperature is lower than the current room temperature.

Insufficient Refrigerant: Low refrigerant levels can cause the air conditioner to stop cooling. If you suspect low refrigerant levels, call a professional for repair.

Dirty Evaporator Coil: The evaporator coil is responsible for absorbing heat from the air, and if it's dirty, it can't absorb heat efficiently. Clean the evaporator coil as necessary.

Blocked Condenser Unit: The condenser unit releases heat from the air conditioning system. It can't release heat effectively if blocked, causing the air conditioner to stop cooling. Clean the condenser unit as necessary.

Faulty Compressor: The compressor is responsible for compressing refrigerant; if it's faulty, the air conditioner won't cool effectively.

Duct Leaks: If there are leaks in the air ducts, cool air may escape before reaching the intended room, making the air conditioner less effective. Have a professional inspect the ductwork for leaks.

If none of the above steps resolves the issue, it's time to call a professional ac service for diagnosis and repair. Attempting to repair the unit without the proper experience and training can result in further damage or personal injury.

In conclusion, there are several reasons why an air conditioner may not be cooling. First, check the air filters, thermostat, refrigerant levels, evaporator coil, condenser unit, and ductwork before calling a professional for repair. If none of these steps resolves the issue, call a professional ac service center for proper diagnosis and repair.