I keep a damp face towel over the screen top of the cold side and my digital reading reads about 15 degrees higher than the hot side. the cold side is a little high while the hot side is about right. I don't mist at all and the readings while the 50w inferred light is off is 80-84 on the cool side while the hot side is about 70. When the light is on it drops to about 74 on the cool side and about 50 on the hot side. The cool side I have a accurite indoor/outdoor with humidity from Walmart and the hot side I'm using just the analog temp/hygrometer gauge. Also its a 20L