So I still haven't bought one but my brother bought 2 of the Airscape 1.7 Whole House Fans. He is the proud owner of a 3,400 sq ft home and a $700/month (summer) electricity bill.

Installation
After a quote for $800 for installation of one of the fans he decided he liked the idea of installing it himself. So he placed an order for the 2 fans on a Friday and received them on the Monday. I went over to give him a hand after work and by the end of that evening we had one of them installed. It took us no more than 4 hours. We like to think of ourselves as being handy but we certainly are not professionals. The installation was very straightforward. We did install it near the attic opening and an existing electrical outlet which eased the installation.

First Impressions
The fans are surprisingly compact but they certainly seam to do the job. His house was down to 72 degrees in no time. Anyone sitting near an open window complained of being cold. The fan is also very quiet and you may wonder if it is on. Certainly nothing like the ratter tat tat and rumble of other Whole House Fans. No one had problems sleeping. Stand underneath it and the draft created will let you know its on.

Does it save money?
It's early days right now. Stay tuned for another update...

Original post New generation of Whole House Fans