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Common Office Appliance Energy Use


The graph above shows comparative energy use by common office appliances (in $/year). The far left bar ($416) is for a normal coffee machine (some use 50% more than this). The second bar ($52) from the left is a coffee machine with no heating element (uses an insulated carafe). Both estimates are for 4 hours of use, 5 days a week for 52 weeks.

The CPU energy use estimates are for a CPU left on all the time ($210) and for one used 10 hours a day, 5 days a week for 50 weeks ($63).

The last bar on the right is for a fax that send or receives a total of 10 faxes per day ($127). The numbers become really striking when we consider there are approximately 550 offices at UH Hilo...


The first thing to recognize in the graph above is the scale (0-$300,000) compared to the first graph (0-$500).

To summarize, if all 550 offices at UH Hilo have a small bar fridge, then we spend over $60,000 a year keeping them cold.

If all 550 offices have a printer turned on but sitting idle, we spend over $20,000 on idling printers.

The difference in cost if everyone leaves their computer on ($115,500) VS only having it on for 10 hours a day, 5 days a week for 50 weeks ($34,650).