There could be several reasons why your window unit air conditioner is not blowing cool air, even when it's on the correct settings. Some common issues to check and troubleshoot include:
Dirty Air Filter: A clogged or dirty air filter can restrict airflow and reduce the cooling efficiency of the air conditioner. Check the filter and clean or replace it if it's dirty.
Blocked Airflow: Ensure that there are no obstructions or objects blocking the airflow both inside and outside the unit. Keep curtains, furniture, or other items away from the front and rear of the air conditioner.
Insufficient Cooling Capacity: Window unit air conditioners are designed for specific room sizes. If the unit is undersized for the room you're trying to cool, it may struggle to reach the desired temperature.
Low Refrigerant: If the air conditioner has a refrigerant leak or a low refrigerant charge, it won't be able to cool the air effectively. This is a more serious issue that requires professional repair by a certified technician.
Faulty Thermostat: A malfunctioning thermostat could prevent the air conditioner from accurately sensing the room temperature and adjusting its cooling output accordingly.
Compressor Issues: Problems with the compressor, such as a faulty capacitor or motor, can lead to inadequate cooling. This also requires professional repair.
Electronic Control Board Problems: Malfunctions in the electronic control board can affect the air conditioner's ability to function properly.
Condenser Coils are Dirty: If the condenser coils are dirty or covered in debris, they won't dissipate heat efficiently, reducing the air conditioner's cooling capacity.
Lack of Maintenance: Regular maintenance is crucial for the optimal performance of air conditioners. If the unit hasn't been maintained properly, it may not cool the air as effectively.
Electrical Issues: Check if the air conditioner is receiving the correct voltage and that the power cord and plug are in good condition.
If you've checked the air filter and ensured there are no blockages, but the problem persists, it's best to contact a certified HVAC technician to diagnose and repair the issue. They have the expertise and tools to identify the specific problem and perform the necessary repairs to get your window unit air conditioner blowing cool air again.