I purchased this one to raise the overall humidity in the room. I have a decent size room with high ceilings that most of my snakes are in along with my birds and it doubles the humidity levels in the room.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I bought it in December and had to replace the filter already this month but that’s because there is dusty birds in the room causing the build up in the filter. Plus, it has been on nonstop almost.