Energy, you would contact Skipper, editor of ReefKeeping Online.
Thanks for the explanation about humidity. My fishroom is situated in the center of the house, so I don't have that option. A window to outside would be perfect, but right now I have to crack open the garage and the door to the garage area (no cars thus no fumes), but it isn't a good solution. I'm thinking of a vent fan, but I'd also like to use a thermostat to turn on a fan to bring in fresh cooler air from the garage area during the winter months to avoid the room getting too warm without having to run the window a/c unit. During the summer, it is cycling on and off as necessary to keep the room 78F.