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Home > Energy Efficiency Tips & Tools > Commercial Buildings > Operations & Maintenance Commercial Buildings Operations and Maintenance - Daily Maintenance At the beginning of the day Turn off outside safety/security lights During partial occupancy early in the day Use only necessary lighting, heating (21°C in occupied areas), air conditioning During full operating hours Adjust thermostats for desired heating or air conditioning levels Turn off lights when areas are not occupied Adjust heating, cooling levels for comfort Keep doors and windows closed During cleaning or partial occupancy at end of day Use only necessary lighting, heating, air conditioning At closing Turn off all lights except safety and security lights In hot season, use ventilation system to admit night air if it will cool building

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