Outdoor unit runs but air from indoor vents is warm or only slightly cool

Safety first: Turn off power before opening any panels. Do not attempt refrigerant charging without proper certification.

Steps:

• 1. Check filter and airflow: Replace the indoor filter and ensure all supply and return registers are open.
• 2. Clean outdoor coil: With power off, remove debris and rinse the condenser coil from inside out with a garden hose.
• 3. Inspect indoor coil: Open the evaporator access panel and visually check for dirt or matting on the coil face. If dirty, have it professionally cleaned.
• 4. Feel refrigerant lines: In cooling mode, the larger insulated suction line should be cold and sweating; the smaller liquid line should be warm. If both are similar temperature or barely cool, the system may be low on charge.
• 5. If performance remains poor: A leak, metering device issue, or failing compressor is likely. Schedule a professional to check pressures and superheat/subcooling.