[undy]

Just remember, exhausting the condenser air out is only half of the problem.

For every cubic foot of condenser air exhausted that means it will be replaced by a cubic foot of untreated, high humidity outside air. That will enter through any crack or opening it can. A "good" portable A/C unit not only exhausts out the condenser air but brings in replenishment air too, from the outside (separate inlet and outlet ducts). Don't forget to empty the pan of condensate every "X" amount of hours too. Most portables have a float switch in the pan that cuts the unit off when the condensate pan gets full.

I just bought 12 of them from Grainger recently.