• In cooler weather, gradually reduce heat settings. (Your employees and customers should feel comfortable at 68°F.)
• In summer, raise air conditioner settings. (Move up 1°F a week. 78°F is optimal.)
• Turn off heat and air conditioning in unoccupied areas. (Conditioning air in storage, basement or empty space is usually unnecessary)
• Turn off heat and air conditioning at night, on weekends or other times your business is closed. (With many systems, it's cheaper to heat or recool at the start of each business day.)
• Turn on heat and air conditioning later in the day. (Delaying system startup by 30 minutes to an hour will really help.)*
• Turn off systems earlier in the workday. (Your building should remain comfortable for an hour or more.)*
• Turn off lights whenever possible. (Just a few hours a day over a year's time can really make a difference.)
• Remove unneeded lighting. (Fixtures near doors and windows often burn energy needlessly.)
• Use lower wattage or higher efficiency lamps.
• Lower hot water temperature. (Unless you wash clothes or dishes, cooler water – about 120°F – will do the job.)

*This may not be necessary during the winter months if your business uses a heat pump, which maintains comfort most economically at a constant temperature.

Source: www.dom.com