Be sure to always turn the equipment and lights off after hours.
Unplug coffeemakers, toasters and microwaves before shutting the office down at the end of the day, weekends or holidays.
Take advantage of the sun. Open shades and blinds during daylight hours. Let the sun heat and light your space naturally; shade it when it's hot, of course. In the winter, close your blinds and drapes in the evening.
Whenever possible, choose ENERGY STAR qualified products.
Take the time to set the energy-saving features on all of your office equipment to put them into sleep mode when not in use.
Shut off all "the nice to have's" such as outside advertising billboards and signage, decorative fountains, pools and waterfalls.
Dress comfortably for the weather. Adjust your layers before adjusting the thermostat.
Use revolving doors to access entrances. It keeps cool/hot air inside.