How hot should the air coming out of my register be?
How hot should the air coming out of my register be? If the AC system is operating correctly, then the air coming out of your vent should be about twenty degrees cooler than the regular temperature inside. So, if you're cooling it and the house is 80 degrees, then you would ideally want the air to be about 60 degrees. What should I do if my thermostat is set at 78? If these steps check out, the National Association of Certified Home Inspectors recommends testing the thermostat's integrity by taping a thermometer next to the thermostat and waiting 15 minutes....