Like programmable thermostats, these sensors help optimize lighting use by automatically turning lights on or off, depending on occupancy. Such sensors work well in conference rooms, break rooms or individual offices that are not occupied continuously. Leave only minimal lighting on during non-business hours if necessary for safety. If you have an office refrigerator or freezer at the work place, keep it full but not overcrowded. Use ice cubes and water containers to fill empty space.
Clean condenser coils three to four times each year.
Be sure to unplug the refrigerator first. Clean heat exchangers and perform routine maintenance on refrigerating equipment to ensure the most efficient operation. When shopping for an office refrigerator, compare operating costs listed on the yellow, federal Energy Guide label that shows the average yearly operating cost of that unit.