Andy Frank of Sealed has a nice series of posts going on home energy guarantees. The concept first captured when I saw Perry Bigelow start offering guarantees on affordably priced spec homes in Chicago. It gets very interesting in existing homes where the absolute error bars are larger--but it's still doable, and we offered a guarantee in my last company. But back to Andy's series:
Part I: Why guarantees matter http://omstout.com/energy-savings-guarantees-101/
Part Ib: Consumer focus group summary http://omstout.com/energy-savings-guarantees-101-part-1b/
Part 2: How energy savings guarantees work http://omstout.com/energy-savings-guarantees-101-part-2/
Part 3: Implications for industry and policymakers (coming soon).