Is there a system that will draw fresh air into the HVAC system when humidity levels are low, ie. under 40-45%? I realize it if tied into the return system it would have to have it's own filter. Are there any moderately( ie. wife says I'm a tightwad ) priced systems out there? I have thought of a simple damper system but that would take too much monitering on my part as far as temps and humidity levels. What I was thinking is something thats automated and is a stand alone type setup. I know $$ can't be given but what kind of dollar range would I be looking at(email me). Not looking for a quote but a range to shoot for on saving some money up to get it done.