I know how you feel - I'm sorry you've been sick. Hope you're doing better! I am not familiar with the hygro-therm by zilla, but the hyrofarm t-stat off amazon is far superior to the Zoomed controller. That is just essentially a dimmer. The hydrofarm is an actual t-stat and only about $5 more.
Actually, here's one for only $26 with free shipping!
http://www.amazon.com/Hydrofarm-MTPR...ords=hydrofarm
I use one of these with my q/t rack and also as one of my backup t-stats. They aren't perfect, but they work pretty darn good in a pinch - and they're far better than a dimmer.![]()