Home is in Springfield, IL, so..... cold in Winter and hot in Summer. 1900 sq. ft ranch on a partial            900 sq.   ft. basement with the rest on a crawl.

 I am going with a heat pump system. 

 What are the different means of moving air that have been proven to work in a tight home {SIPS} with my climate conditions? I have been looking at the HE150.http://www.smarthome.com/3033.html. I know that there are more expensive systems, but  is their really a difference other than the cost of the filters?

Also, l just came across this and was wondering if their claims are varified
http://www.smartvent.net/Default.htm 

I am running out of time here, so any help would be appreciated.

Thanks!

Kevin