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

Safety first: Unplug the unit before cleaning coils or filters.

Steps to improve cooling:

• 1. Clean filter: Remove and wash the air filter with mild soap and water. Let it dry completely before reinstalling.
• 2. Clean coils: Inspect both indoor (evaporator) and outdoor (condenser) coils. Gently vacuum or brush off dust and debris. Use coil cleaner if heavily soiled.
• 3. Check installation: For window and through-the-wall Koldfront units, ensure there are no gaps around the chassis where hot outdoor air can leak in. Seal with foam or weatherstripping.
• 4. Verify mode and setpoint: Make sure the unit is in Cool mode, not Fan or Dry, and set the temperature at least 5°F below room temperature.
• 5. Room size: Compare the unit’s BTU rating to the room size. If the room is larger than the unit’s rating, it will struggle to cool adequately.
• 6. Professional check: If airflow is good and installation is tight but cooling is still weak, a technician should check refrigerant charge and system performance.