1. Take a look at the thermostat.

If your thermostat reads "on," your system's fan is running. This implies that even if the interior unit isn't cooling, the fan will continue to blow air through the ducts and out of the vents. For your air conditioner to chill and dehumidify your interior air as the fan circulates it, set your thermostat to "cool" or "auto."

2. Check to see if the outside unit is powered.

Your air conditioner is high-powered equipment, which means it…