Troy,
I think you will find if both the Humidity and the Temperature readings are that far out in the wrong diretcion together, the dewpoint calculation will become meaningless and you will either always have the heater on or it never turns on when you need it !
My (limited) understanding is the Dewpoint calculation is actually quite a fine line !
But exerimentation may yield a workable system - I don't know enough to help here.
Rally
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