My wife and I just had a QuietCool whole house fan installed by Lincoln Hills Construction. WOW! First off it truly cools our home down to the core. There has been no need to run the AC until way late in day. And quiet, as compared to the traditional design fan I had in my old house that sounded like an airplane, this one is quieter than the AC running. Most of you know how thrifty and picky I am, I had several quotes and Lincoln construction did the work himself and has the best price. Our energy bill has dropped so significantly that it will be paid for in less than 2 years. Plus, Roseville Electric has substantial rebates ($400/fan). I am sure SMUD does too.