If your wall air conditioner is blowing icy cold air, and you've confirmed that there are no refrigerant leaks, the filters and blower are clean, but your room is not reaching the set temperature, there are a few potential issues that could be causing this problem:
Improper Sizing: The air conditioner might be undersized for the room you are trying to cool. If the AC unit's cooling capacity is not sufficient for the size of the room, it will struggle to reach and maintain the desired temperature, especially during hot weather.
Poor Insulation: Inadequate insulation in your room can lead to heat infiltration from outside, making it challenging for the air conditioner to keep up with cooling demand.
Air Leaks: Check for any air leaks around the windows, doors, or other openings in the room. Air leaks allow warm air from outside to enter the room, making it harder for the air conditioner to cool effectively.
Blocked Airflow: Even though you mentioned the filters and blower are clean, double-check that there are no obstructions or blockages in the airflow path, such as furniture or curtains covering the vents.
Thermostat Placement: The location of the thermostat can affect the AC's performance. If it's placed in a spot with direct sunlight or near a heat source, it might register a higher temperature than the rest of the room, causing the AC to shut off prematurely.
Compressor Issues: There could be an issue with the compressor or other internal components of the air conditioner that is hindering its cooling performance. Faulty or inefficient components can result in reduced cooling capacity.
Overworking: If the ambient temperature outside is extremely high, your air conditioner might be overworked, and its cooling capacity may be limited in such extreme conditions.
Excessive Heat Load: If there are many heat-generating sources in the room, such as electronic devices or appliances, they can contribute to an excessive heat load that the air conditioner struggles to handle.
In such situations, it's best to consult a professional HVAC technician to diagnose and address the specific issue. They can assess your air conditioning system, identify the root cause of the problem, and perform any necessary repairs or adjustments to restore its cooling efficiency. Additionally, they can provide advice on how to improve the room's insulation and optimize the performance of your air conditioner.