Belly heat for digestion is a myth. It is body core temps, how they get it doesn't matter. I thought I'd just point that out, it is quite a common one. Humidity and poor sheds is an annoyance low heat is life threatening, something to remember, heat then humidity. How and what is immaterial as long as you have the correct temps and humidity how is up to you. It sounds like you have that sorted anyway.
best of luck