The California Energy Commission offers residences and small businesses up to 50% of the cost of a new heating or air conditioning system if it meets their standards for emerging renewable technologies, like solar heating, but more. Their program is called Emerging Renewables Buy-Down Program. To learn more, contact California Energy Commission, Energy Call Center, 1516 Ninth St., MS-25, Sacramento, CA 95814; 800-555-7794; {http://energy.ca.gov/greengrid/index.html}. Check with your state utility commission in the blue pages of your phone book to see if your state offers similar programs.