The air coming out of your residential air conditioning supply vents should ideally be fifteen to twenty degrees Fahrenheit cooler than the ambient room temperature measured at your thermostat. For example, if your indoor living space is currently seventy-five degrees, properly chilled supply air should register between fifty-five and sixty degrees. This temperature differential indicates that your evaporator coil is absorbing heat effectively and that refrigerant pressures are optimal. If the temperature split is significantly lower—such as only five to ten degrees—it usually points to low refrigerant, a dirty air filter, or restricted airflow. You can troubleshoot by measuring vent temperatures with a digital thermometer. You can verify that your cooling system is operating at peak efficiency when this standard fifteen-to-twenty-degree differential is achieved consistently.
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