If you haven't already... be sure to check out the Energy Upgrade California website. All you have to do is enter "Sacramento County" and you will be brought to a specialized page that gives you rebates and incentives that are available in Sacramento County for doing "green" upgrades. You can also locate certified contractors in your area along with all kinds of tips and facts.
This is a cooperative program that is funded by the American Recovery and Reinvestment Act and managed by the California Energy Commission. The basis of the program is to help raise energy efficiency percentages for California residents while helping out of work contractors get the necessary training to do the energy retrofit work. This program is truly a "win win" program for residents of California.