The issue with a dimmer if used instead of a t-stat is that every time the ambient temp will fluctuate every time you will have to adjust the dimmer, a thermostat does that for you whether you are there or not.
I like using dimmer as temporary measure (which in my case mean animals that are in QT)
As far as using dimmer and t-stat I prefer using a t-stat and a back up t-stat.
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