As Dave, rainbows-r-us, said you can hook the entire stack to one thermostat.

I however like to use a seperate thermostat for EVERY cage. I figure, if one fails, I only have the problem in one cage vs. the entire group.
Also, it is easier to maintain the best gradient this way.
I know a lot of people who put one thermostat per row of cages, so that they are all on the same heat level. I do not like useing one per column because heat rises.

I just plug the thermostat into the wall, plug the flex-watt into the thermostat and tape the probe onto the floor of the cage centered on the heat (and put the substrate on top).

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