I'm on the east coast of Florida. (Titusville) I don't believe that it gets cold enought here for me to worry about how much WVO I use. If you live up north then in the winter you would have to heat it a little or just use less WVO. I like the KISS method (KEEP IT SIMPLE). I made a heat exchanger for running 100% but never have installed it cause this way is just to simple.

mrbill240D