An air conditioner that takes longer than usual to cool the home, cycles on and off repeatedly, or leaves some rooms warm may need attention.
- Weak airflow from registers, a filter that becomes dirty quickly, or ice forming on the indoor coil can point to restricted airflow or another operating problem.
- Unusual grinding, rattling, buzzing, or clicking should not be ignored, especially when the sound is new.
- Water near the indoor unit, a blocked condensate drain, or an unexplained increase in cooling energy use also deserves a maintenance visit.

