“…These programs require behavior change by program sponsors (usually utility companies), home contractors, home buyers, and sometimes mortgage lenders, who may offer preferential access to financing of energy-efficient homes because they have lower operating costs. HERS have varied greatly in their success penetrating markets (some programs have reached 2% of new homes per year, whereas others have reached 100%), mainly because of differential success in influencing the decision processes of consumers and contractors (Vine & Harris, 1988). Success is most likely when the program sponsor advertises it well, offers builders marketing assistance and advertising money, is credible with local consumers, and cooperates with builders' associations.…”