Raising ambient temp but not basking temp?

[AndrewM1217]

So last year around this time I still had my spotted Python in a glass tank with a UTH. Now, he is in a 3x1.5x1.5 enclosure made of wood with a sealed finish (melamine? I think that's what it's called but I'm unsure). Anyway, since the bottom panel is too thick for a UTH I've been using a CHE. With winter being here, I've noticed dips in the ambient temp. It's sitting at about 82 degrees on the warmer end and 79-80 on the cooler end of the cage. His hot spot right under the UTH is fine at 92 degrees, but i'd like to raise the ambient temp back up to about 81-87 for the cool/hot ends respectively. Outside of installing a radiant heat panel, is there an easy way to achieve this?

Also, I've noticed the CHE definitely dries the cage out faster than the UTH. Thankfully spotted pythons don't need a ton of humidity, but any tips and tricks to keep the humidity up are welcomed as well. I was thinking mixing a little damp sphagnum moss into his substrate.