Set thermostats lower in the heating season - some school and government agencies set their heat at 65 degrees. Encourage employees to wear sweaters.
Open windows and use outside air as much as possible to heat and cool space. Install automatic thermostats (with timers) for heating and cooling systems. Reduce the number of hours when using heating or cooling systems - e.g. turn them on one hour before opening and off one hour prior to closing.
Purchase software to automatically shut down all computers at a designated time. Businesses with a lot of computers should use energy efficient fans to cool them.
Insulate duct work and hot water pipes that can leak heated or cooled air into unconditioned spaces. Insulate or replace windows. When reroofing a building, consider using R-30 insulation.