This is an inaccurate statement, heat panels and CHE's will definitely increase ambients.
In your case, I would suggest covering the screen top entirely with 3 sheets if time foil, shiny side down, and tape the hole thing over (On the outside, NO TAPE IN THE ENCLOSURE). Cut a hole for the CHE dome, and a 1.5"x1.5" cutout on each side for airflow. That will help keep up the heat and the humidity.
Also, the CHE will give a hotspot as well as increase ambient temperatures, so make sure you use a temp gun for the hotspot and that the CHE is on a thermostat (or at the very least a dimmer if your room stays a consistent temp, but this is less foolproof)
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