First off, I use the Mr. Moisture system more out of convenience than anything else. I suppose if you keep the susbstrate moist enough by occassionaly misting it by hand with a spray bottle, you could save yourself the $100. It would take a lot of work though. It just saves me a lot of trouble and I think it looks awesome, too. It's a real crowd pleaser when it starts "raining" in my habitat. As for the thermostat, I'm glad you picked up the fact that it's only a single zone. I totally neglected to mention that. I myself only have the one thermostat, and only have one thing hooked up to it, a 150 nightglo bulb, that stays on the cool side of the cage and comes on when necessary to keep the temps between 75-80. You would need multiple thermostats for each area of the cage you want at a different temperature. I have actually figured out, through trial and error, what combination of bulbs and wattages produces the correct heat throughout the entire cage, so my only concern is making sure it doesn't fall below 75 on the cool side of the cage while she's sleeping. Another word of caution, thermostats work best with lights, though not powersuns or activelights since they take about 10 minutes to get going and have to cool down again after being turned off to be turned back on. They really won't work at all with ceramic heaters either. You should check the temps in you cage first with a thermometer and see how everything is. A thermostat really just serves the purpose of heating the cage if it falls below a certain gradient, which is why I've only got one to keep her cool side of the cage in check when she's sleeping at night and all other heat sources are turned off. Hope this helps. Sorry it's so long. But feel free to ask away if this doesn't answer everything.