Switch to highly rated energy-efficient appliances. The federal government’s Energy Star program rates appliances.
Schedule regular service for heating and air conditioning systems, and fit them with timers so that they’re in use only when people are in the office.
Change electricity suppliers to those sourcing power from green initiatives.
Install water-saving taps, showerheads, and low-flush or dual-flush toilets.
Take advantage of natural lighting, and install task lighting and high-efficiency compact fluorescent lighting.