If your window AC is blowing warm air, the issue could be with the thermostat settings, clogged air filters, low refrigerant levels, or a malfunctioning compressor. Check the temperature settings on your unit to make sure they’re correct.

If your AC is running but not cooling effectively or if you notice frost building up on the coils, it might be low on refrigerant. Other signs of low refrigerant include hissing sounds coming from the unit or warm air blowing instead of cool air. A certified technician can check refrigerant levels and refill or repair any leaks in the system.

Loud noises from a window AC can be caused by several factors. The most common reasons include a dirty or damaged fan, loose parts, or debris inside the unit. Turn off the AC and check the fan for any visible damage or obstruction. You might also need to tighten screws or replace the fan motor. If the noise continues, you may need professional assistance to diagnose and fix the issue.

If your window AC is leaking water inside the room, it could be due to a clogged or misaligned drain line, dirty filters, or frozen evaporator coils. First, check the drainage system and clean it if necessary. Ensure that the AC is properly installed with the correct tilt for proper water drainage. If water continues to leak, it might indicate a more serious issue like refrigerant problems or damaged components.

Some minor repairs and maintenance, such as cleaning filters, coils, and drainage lines, can be done by homeowners. However, for more complex issues like refrigerant refills, compressor failures, or electrical faults, it is best to call in a professional. Incorrect repairs can lead to further damage and more expensive repairs down the line, so it’s important to know when to seek help.