Air conditioner runs but does not cool the room effectively; supply air feels only slightly cool.

Safety first: Turn off power before cleaning coils or filters.

• Clean indoor filters: Remove and wash filters with mild soap and water. Dry completely before reinstalling.
• Clean indoor coil: Use a non-rinse evaporator coil cleaner or soft brush to remove dust from the fins.
• Clean outdoor coil: Gently wash the condenser fins from inside out with low-pressure water, avoiding bending fins.
• Check room conditions: Close doors and windows, reduce heat sources (ovens, direct sun) and ensure the unit is correctly sized for the room.
• If performance is still poor: A technician should check refrigerant charge and inspect for leaks in Haier's indoor and outdoor coils and line set.