%0 Generic %K Middle income energy efficiency %K Renewable energy: policy %A Mark Zimring %A Merrian Borgeson %A Ian M Hoffman %A Charles A Goldman %A Elizabeth Stuart %A Annika Todd-Blick %A Megan A Billingsley %D 2012 %T Scaling Energy Efficiency in the Heart of the Residential Market: Increasing Middle America's Access to Capital for Energy Improvements %8 03/2012 %9 Clean Energy Financing Policy Brief