Use fluorescent bulbs instead of incandescent bulbs.
Look into ways you might be able to set your water heater to limit hot water usage (keeping in mind that those who take 6AM showers for 30 minutes could screw over others who get stuck with cold water.)
Depending on your area- influenced by state law and whether you are in a deregulated municipality with regard to electric utilities- you might be getting charged a higher rate for electricity that you use in excess of a basic amount.
It is not uncommon, in a 1 bedroom apartment, to pay- say- 6 cents per kWh for your first 500 kWh of usage. Any extra usage can cost 1-2 cents more per kWh!
So if someone is running their window AC unit to keep their room at 60 degrees in the summer, they may well be spending as much money as 5-6 other people keeping their room at 72 degrees.
Another big one is windows. Make sure there are good blinds or curtains to cover all windows with sun exposure. That can make an enormous difference.
Consider charging some extra money to those with mini-refrigerators in their rooms. Those use a lot of power too.
If you have free washing machines, switch out to machines that charge money. Another appliance that uses a lot of power.
Finally- look into the cost to fix your central AC. You still need it for common area rooms, and if it is running inefficiently it could be costing you a fortune to give little benefit.
It may be expensive now to fix it, but it can save a bundle in the long run. So I would suggest you have a contractor test it and help you determine the up front cost to fix it versus the savings over the next 3-5 years of use.
On a final note- make sure every single thermostat for the central AC, and maybe even common area water supplies are somehow locked or secured with limited access to house managers and/or chapter officers. Someone fooling around with those things can get very expensive very fast.
Hope this helps.
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