How ever you regulate the temps and what you use are not important that you do is.
Rheostats do best in stable room temps. ON/Off T-stats do well with heavy massed enclosure and with out really low room temps. Things that have lots of thermal mass balance out the fluctuations that are typical to on/off style. Proportional T-stats will handle most if not all environments and ultimately are the most flexible.
Worry about HEATING and don't bother with humidity until the heat is sorted. Poor humidity is not life threatening. However you manage you heat as long as you can manage to get the hot and cool side temps correct (80 cool 90 hot) and can keep the ambient air temp between 80-85 you are fine how ever you accomplish this. It doesn't matter what works or does not work for some one else, every bodies houses have their own quirks that effect the enclosure.
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