No. The Passive House has scientific and engineering validity as well as tried-and-true practical success. There are currently more than 6,000 Passive House buildings operating in Europe. The oldest one of them has been up and running since 1991. Many Passive Houses have been monitored and average overall performance proved to be right on the target of 15kWh per square meter and year. The Passive House Institute is in charge of the Passive House standard and it is being rigidly enforced and monitored. In 2008 there are 2 completed Passive Houses in the US that we are aware of, and about a half-a-dozen under construction. The European success and experience serves as a great resource for Passive House design in the United States. Think of it as a version 2.0, with a version 1.0 that has already been tested and used for 17 years.