Dimmers huh? Something else to look up lol!
Could I just use two different heat mats and two different thermostats, one for the hot side and one for the lower side? Or is a dimmer actually needed? I'm not really sure how those work.

Would two of these work okay? I was planning on using Ultratherm undertank heating pads.
http://www.beanfarm.com /store/agora...id=22028&xm=on