Enclosure for Boa

[Sauzo]

Thats a real High Wattage for a 20gal.. Your going to have trouble with Humidity for sure and if you cover the screen that wattage is going to bang out Hot Hide temps. You dont want to dry the snake out. I bet if you check the substrate in the enclosure directly under that CHE it will be a easy 85 after a few hours because my 60 watt was above the cool hide and was a min of 78. If its to hot just raise your CHE higher above the screen or use tour Dimmer until you find the right temp. The enclosure is going to cool a little at night when the house cools but thats natural anyway.

You are doing something wrong lol. There is no way you can need a 150 watt CHE to just maintain an ambient temp of 78F. Ambient temp is the air temp, not an object temp. I personally have never checked the cool side temps in my cages. I go off 2 temps, the hot spot which like i said is either from the top of the warm hide if using a CHE or RHP and the glass temp or floor temp under the substrate if using a UTH or heat tape. The second temp i pay attention to is the overall ambient temp which is the air in the whole cage. I keep that temp at 77-79F depending on the room temp. This is because a snake needs to cool down and warm up. Being stuck in either only will lead to health issues.

And this was meant for the OP, not Calm