i have a free standing unit in one of my offices.......it is a very small office in the back of our shop and has a lot of electrical devices like security system and phone wires so it gets quite warm for me. the free standing unit requires a hole be drilled in the wall (there is not a window in this office) and the water line turns into mist so there is no drip. it works for the very small space that i am in which honestly is comparable to a walk in closet. BUT it is very loud and on super hot & humid days that puppy has to run the whole time I am there.
if the chin room has a window I suggest a higher btu unit in the window, versus a portable unit, that way you get the cooling power you need without have to cut a hole in the wall.
oh and just to add........the exhaust area where the air comes out is ridiculously hot. it goes into our shop so it doesnt affect me, but if you have it going into another room, it will be like an oven!!!