10. Turn off computers and other office equipment when they're not being used, especially overnight and weekends. Cost: Nothing! Savings potential: As much as $44 per year, per computer, depending on what you pay per kilowatt-hour.
9. Install an occupancy sensor in hallways, bathrooms and other areas where lights can be left off most of the time. Cost: Between $25 and $80. Savings potential: About $40 per year depending on where the sensor is installed.
8. Lower the thermostat on your water heater. Cost: Nothing! Savings potential: About $24 per year, if the setting is reduced by 10 degrees F, and operates at the lowest allowable temperature for normal use.
7. Turn off your water heater overnight and on weekends. Cost: Nothing, or $30 if you buy an automatic timer to do it for you. Savings potential: As much as $54 per year depending on how much hot water you use.
6. Set back your thermostats at night and on weekends. Cost: Nothing! Savings potential: About $1,800 per year for a 33,000-sq. ft. office building with a thermostat set at 75 degrees F, 24 hours per day during the heating months.
5. Close drapes or blinds in warmer months to keep the sunshine from overheating your house. Just do the opposite in the colder months to give your thermostat a break. Cost: Nothing! Savings potential: About $5 per window depending on location and time of year.
4. Clean all air filters monthly. Cost: Nothing to clean, and about $2 if you need to replace one. Savings potential: As much as $60 per filter, depending on the size of your HVAC system.
3. Check for drafts coming from doors and windows, then caulk and weather-strip them as necessary. Cost: $5 or less. Savings potential: About $2 per fixed draft.
2. Adjust your thermostats for colder weather. Simply set them at the lowest temperature allowable that keeps employees and customers comfortable. A setting of 70-75 degrees Fahrenheit (F) is the standard industry recommendation. Cost: Nothing! Savings potential: About $1,000 per year for a small office building open Mon.-Fri., 7am to 7pm.
1. Install LED exit signs. They're 100% longer lasting than conventional exit signs and the most energy efficient of their kind! Cost: About $70 to retrofit. Savings potential: About $24 per year, per sign, not to mention the maintenance savings.

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