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If you run a retail location open to the outside, close the door.
If you run an office, create a different dress code for summer such as "Suit jackets and ties are not required during warmer temperatures". You can save on air conditioning costs this way.
Open blinds or window coverings to heat your building. Close them when air conditioning is on.
If you have signage that is on all the time (like exit signs), convert them to LED signs.
Purchase an LCD monitor to replace CRT monitors and reduce the power used by at least 50%.
If you have a home office or an office with a window, shut your lights off when it's bright outside. Use a single desk lamp if possible when it's darker outside. - Mark Kawabe, The Niagara Guide