The Energy Information Administration (EIA) has released a report based on a survey of commercial buildings in the US that shows how electric power is used in commercial buildings. The types of end use of electricity include lighting, ventilation, cooling, personal computers, refrigeration, and others. This analysis is based on a survey of commercial buildings conducted by EIA in 2003.
If you include all energy sources, not just electricity, then space heating, typically gas or oil, is the largest consumer of energy.

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