I'd advise against using a portable personally. I'm running a 14k btu dual hose now and it's been nothing but a headache, and 1 side outside of my house smells pretty dank. Regardless of hose count they still pull air from any hole in the unit and toss it out the window. Very inefficient.
Id pick up a window unit personally. If you cant put it in a window, box it up and throw a fan on it, if you can operate a drill and saw you can build a box. This is what I'm doing tomorrow. Power consumption alone will make the window unit pay for itself over the summer.