Indoor unit blows air but not cold (poor cooling performance)

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

Steps:

• Verify settings: Ensure the unit is in Cool mode, set temperature at least 3–5°C below room temperature, and fan speed is not on the lowest setting.
• Clean filters: Remove and wash filters, dry completely, and reinstall.
• Clean indoor coil: Gently brush off dust from the evaporator fins. Use a non‑rinse coil cleaner if heavily soiled.
• Clean outdoor unit: Remove debris from around the outdoor unit and clean the condenser coil fins with low‑pressure water.
• Check doors/windows: Close doors and windows in the conditioned space and reduce heat sources (sunlight, ovens, etc.).

If cooling is still weak: A technician should check refrigerant charge, compressor performance, and system pressures.