These are high performance house plans built by Dave Cady, Performance Homes NW, and designed by JB Hammer Designs. They feature 8" wide walls, energy heel trusses, and higher R-values for the complete envelope. They also have high performance doors and windows and on-demand water heaters. All heat ducts are enclosed in the conditioned space. Check builder's website for availability. http://performancehomesnw.com/