If you have a balcony or patio area (assuming you are in an apartment), you could opt for a split A/C. These have most of the A/C "guts" in a box that sits outside and a couple of hoses that hook up to the heat exchanger inside. The outside box chills water, pumping it through the inside heat exchanger. They're more efficient than window A/C units, and get around rental agreements prohibiting window units.