I been having problems keeping night time temps up in Darwin's new larger tank. I got a 150w CHE from eBay for $9.00 and I lucked up at my local PetSmart and found a ZooMed Hygrotherm humidity and temp controller all in one, in the CLEARANCE rack for $30. I found the same one online for $75 and that makes me do the happy dance! I don't use the humidity plug cause I have no problems in that department being that it stays at 99%. But I just wanted to say this thing is GREAT! If your in the market for one. I recommend this one!