From the NY Times:
Experience has shown that virtually any older or historic house can become more energy-efficient without losing its character. Restoring the original features of older houses — like porches, awnings and shutters — can maximize shade and insulation. Older wooden windows perform very well when properly weatherized — this includes caulking, insulation and weather stripping — and assisted by the addition of a good storm window. Weatherizing leaky windows in most cases is much cheaper than installing replacements.
The labor-intensive process of rehabilitating older buildings would also create jobs, and this labor can’t be shipped overseas. The wages would stay in the community, supporting local businesses and significantly increasing household incomes — just the kind of boost the American economy needs right now.