Soleus makes some good portable air conditioners. I purchased one that was an A/C, heater, de-humidifier. It has an intake and exhaust that you can vent through a window. If I were you, I would cool/heat the hallway and draw intake air for each room from the hall. And you can tie your exhaust lines together above each room. Then vent through either side with like a 12x24" attic vent or so.

Hope this helps....

CanGroIt::::::