It also depends on your room ambient temp. Right now my office/snake room stays at about 84 degrees so all the terrariums are around that temp and the RHPs don't even kick on. If you live in a place where it gets very cold, you may have to bump it up in the winter to 90 to make sure the "cool" side of terrarium is properly heated. You'll have to play around with it.
I do highly recommend on getting a proportional thermostat if you haven't purchased one yet. They are a bit pricey, but with proportional feature, the RHP kicks at a certain percentage just enough to keep the temps up. I personally have had the Herpstat thermostats and absolutely love them. They have a lot of different safety features including a probe for humidity, temp night drops and even can turn on and off light feature.
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