You are in luck! I run one of the largest gas energy efficiency programs in the US. In this field for about decade and love it. Tell your brother to contact his Gas and Electric utilities first. Almost all utilities are required to have incentives for Energy efficiency and in many cases, its all free for small businesses. Also look at Water savings by changing aerators to 1 GPM. Let me know some details about building, where it is in State / County and i can help to find you exactly where to look for free money incentives for Energy efficiency worl.