Klarstein air conditioner runs but does not cool the room effectively; air from vents is only slightly cool or room temperature.

Safety: Unplug the unit before cleaning internal components.

Steps:

• Check settings: Ensure the unit is set to Cool mode with a temperature at least 3–5°C below room temperature and fan speed set appropriately.
• Clean filters: Remove and wash all intake filters. Let them dry completely before reinstalling.
• Clean evaporator: Remove the front cover and gently brush or vacuum dust from the indoor evaporator fins. Use a foaming coil cleaner suitable for AC units if heavily soiled.
• Clean condenser: Access the rear or outdoor condenser coil and remove dust and lint with a soft brush and vacuum.
• Check doors/windows: Close doors and windows in the conditioned space. Avoid heat sources (ovens, direct sun) near the unit.
• Room size: Compare the Klarstein unit’s BTU rating to your room size. If the room is significantly larger than recommended, the unit will never cool effectively.

If airflow and coils are clean and the unit still does not cool, the refrigerant charge or compressor performance may be low and should be checked by a technician.