I'm a first-time reptile owner. My family and I have been trying to set up a terrarium in anticipation for our ball python, who we'll buy three days after the tank's conditions have stabilized. There's been a problem with the lack of humidity, though. I live in an arid area in Colorado, and we've been unable to get the humidity to remain above 40% without constant spritzing. Are there any good fixes for this? Thank you.

Some more information: The tank is a 30x12x12. Everything included was one of those Zilla starter kits, plus an extra branch and such. Thanks again.