Although commercial and institutional buildings vary greatly from one to another in size, use, and type of construction, there are general recommendations for creating energy-efficient commercial buildings in a hot and humid climate.
A database of energy efficiency programs by state based off of the North Carolina Clean Energy Technology Center's Database of State Incentives for Renewables & Efficiency (DSIRE). Efficiency programs are categorized by residential and commercial programs.
U.S. Department of Energy webpage on strategic energy management and retro-commissioning of commercial buildings