Oh and my enclose is a 20L, I am looking at a male, so they won't get an large.
For a 20L considering your house is no colder than 65 I would go with a 100 Watt CHE and use Tin Foil & a hand towel over the top for heat and humidity. That is what I used in 20L & 33L quarantine tanks. Kept my cool side 78-82.