... I think the front and back half of the coop are essentially two different zones with different sunlight, different air flow and different temperature.
I do not mean to be argumentative.
The Woods KD is an integrated "system" whereby fresh air in the back section is exchanged either through the upper monitor windows when they are open (summer) or through the open front by means of circular air flow (in the bottom front and out the top) during the winter. If it were not this way the design would not work at all. Certainly the two sections have different sunlight but the airflow and therefore the temperatures are constant in both front and back sections.
I am uncertain at the moment the extent this is explained in Woods' book but there are a number of threads herein that explain this principal. The most revealing comment is the advice to go into the back and hold a wisp of paper/cloth and watch how it flutters when the upper monitor is closed,