As a contractor, it is important to know what rebates are available to both residential and commercial customers. This will allow you to act more as a consultant and less like a “sales rep”. Help your customer compare products, understand which rebates are available to them, and walk them through the submission process to insure they actually get their credit. This type of first class service encourages referrals and repeat business.
Find rebates in your state at http://www.dsireusa.org.