What exactly are you using to measure the temperature and humidity? A messed up gauge can throw everything off, digital is best.

A quick fix for the humidity is creating a humid hide. Do a search on this site, there are tons of threads concerning them.

With the temperature, it sounds like the enclosure should be heated. What are the dimensions?

Like I said first, if your temps are bad....first thing I do is check what I am measuring temps with.