you already had an air handler system for circulation yes? natural venting, what is the orientation you can cause this effect with a passive solar method if you plan ahead.
Antisthenes -- I'm trying to avoid installing either an air-handler or duct work. Currently relying on optimizing orientation, providing deep overhangs, fenestration screening, lots of natural ventilation, whole house fans, etc. Client's not sure that's going to be enough to protect resale value.