On the commercial applications it is different than the capacitor bank that does nothing but correct for Power factor. They are placed on the static side of the load as close to the motor as possible. They are not going after power factor correction, but it does come as a byproduct to a certain extent. They are after KWH and the demand you mentioned. For commercial customers that get hit with a demand charge this is a big advantage. These products can work in conjuction with those that have the capacitor banks that just increase the power factor so there is not a charge.
When I walked through the 2 commercial sites because I was interested in learning more we went over those things. I am convinced it works for the commercial side. I saw the electric records of a church / school that went back to 1993. Their average KWH per month was 11,200 then and had grown to 36,842 by 1995 and 40,005 by 2002. In late '02 they did this and thier average for 2003 was 35,878. Between that and the other reference letters that state from 10% to 22% reductions I know it works, commercially anyway.
Now as for the home side it is the same principle, but you just don't have big enough power draws to make it cost effective to treat maybe 2 A/C's with individual power correction units so they treat the whole house so it actually catches the big appliances when they start up and run. I guess I will find out how well it works over the next few months, since I am already having to run the A/C here. My brother in law, who is in Omaha, NE put this on his house about a month and a half ago. He said he saw over a 40% reduction on his house in the last month. Now I know I will have to see several months, and with the A/C running to get a better idea. I really do appreciate all of your input.
I guess that no one has heard of any other products that aim to reduce electrical use, but your skepticism of this is duly noted for a residential application. I guess I will see what kind of savings I get on the house. Again the initial reason for the post was to see if there was anything else out there that may work better. Just doing some research through different forums to get all the input I can. Thanks