Warm air from the vents, long afternoon run times, or an AC that never reaches the thermostat setting can point to several problems. Restricted airflow, a dirty coil, or low refrigerant may be involved. Outdoor-unit trouble or a control problem can cause the same kind of hot-house call. Letting it run this way can add strain while your home stays hot. The right repair should address the cause and help the system cool normally again.


