Indoor unit runs but does not cool effectively; air is only slightly cool, or the room never reaches the set temperature.

Safety first: Turn off power before cleaning coils or filters. Do not attempt to handle refrigerant yourself.

• Clean filters: Remove and wash indoor filters with mild soap and water. Dry completely before reinstalling.
• Clean coils: Gently vacuum or brush the indoor coil fins. Clean the outdoor coil with low-pressure water from inside out.
• Check room conditions: Close windows and doors, and reduce heat sources (sunlight, ovens, many occupants) where possible.
• Verify mode and setpoint: Ensure the unit is in Cool mode with a set temperature at least 3–5°C below room temperature and fan on appropriate speed.
• Call a technician if still weak: If performance remains poor after cleaning and correct settings, a technician should check refrigerant charge, system pressures, and confirm the unit is correctly sized for the space.