mini splits are much more efficient, much quieter, look better, and do not 'ruin' a window (reason for a window is to be able to look out and have light come in, this doesn't work so well with a big a/c in it).
obviously the window unit is cheaper and easier to install.
if you plan to stick...
Hi,
I have installed a few mini splits before (1 LG and 1 Mitsubishi).
I am looking to install another, this time a two head unit. I have a question about the maximum length of tube sets I can use for this unit before having to add more refrigerant. One of the heads will need a ~12' line set...