The difference between the incoming (room temperature) air and the outgoing (cold air at the closest outgoing air vent near the A/C inside the ceiling package) air. It’s typically 18 to 22 degrees when operating properly (based on several conditions). Sometimes the air conditioning is working properly, but the atmospheric conditions make it feels like it is not. Delta temp can verify that the air is operating properly, but the conditions won’t allow the camper’s interior to cool to the desired temps.
