Frat House Energy Saving Tips?

[ISUmatt]

I live in a house of 33 or so people and next year we got stuck paying utilities (granted, our monthly rent was lowered $40), and our house manager and executive VP are looking for some ways to lower our utilities so we're not stuck paying more than $40 per person (which would come out to about $1300 per month). We had heard something along the lines that our water bill alone was almost a grand, and I can only imagine what the electricity bill was.

One of the problems is that we have central air but it's no good, so basically every room (about 13 rooms in the house) have their own air conditioners, which drains electricity like crazy. It would be ideal to be able to charge each person per unit (their own room) instead of the house as a whole and averaging it out to each person, regardless of how much they specifically used, but that can't happen.

What are some easy but practical things we can do (meaning something we don't need our realty company to sink a lot of money into and take forever; more along the lines of things we can do ourselves)... we've already had our realty company put in low-flow shower heads and those toilets that are supposed to save water. There are also light timers in the bathroom that go up to half an hour. Aren't there specific light bulbs that use like 1/2 as much electricity as normal light bulbs?