Wattage for a CHE in a 20L glass viv?

[CALM Pythons]

I went for the 100W because I have a thick layer of mulch for my substrate (combating humidity here) and it is actually perfect. My cool side didn't quite reach 77/78 so I added a small IR light on the cool side and it is working perfectly.

Thank you!

Good. Once warmer weather comes (60's) keep a eye on it. Whenever my house warms up the enclosures need adjusting. I could never understand that seeing how i run thermostats but it must have to do with the lack of chill after winter temps from the walls and floors even though interior ambients are the same.