From our Councilmember Jim Graham:

The District of Columbia Weatherization, Rehabilitation, and Asset Preservation Program (DC WRAP) offers grants for weatherization improvements to qualifying homeowners.

Homeowners can receive up to $2,300 in improvements to their homes to help reduce energy costs. Qualified participants will receive a free energy audit and recommendations for improving efficiency. Contact Robert Adams of DC WRAP at 202-624-5867

WRAP is available in other states – check here and here.