Air conditioner runs but does not cool the room effectively; air from the outlet is only slightly cool.

Safety: Unplug the unit before cleaning coils or filters.

Steps:

• Clean filters: Remove and wash the intake filters with mild soap and water. Dry completely before reinstalling.
• Clean evaporator coil: Access the front coil and gently brush or vacuum dust from the fins. Use a non-rinse coil cleaner approved for aluminum fins if heavily soiled.
• Clean condenser / exhaust: For portable units, ensure the exhaust hose is straight, short, and not blocked. For window units, clean the outdoor coil with a soft brush and low-pressure water (power off, avoid soaking electrical parts).
• Check room size and heat load: Verify that the unit's BTU rating matches the room size and that doors/windows are closed and sun/heat sources minimized.
• Professional check: If airflow is good and coils are clean but cooling is still weak, have a technician check refrigerant charge and compressor performance.