If you are going
to buy a new a/c, why not try out a portable unit, I bought one last October, I am from South Africa so our summer starts in October and only ends around APril, so for the greatest part of the year it is summer(38 degree Celsius) not my favourite season. I bought a Portable unit as we are renting a house, to be more specific a Olimpia-Splindid Piu, it is an Italian company, it really delivers, reatively quiet and very good at cooling down the room. Most houses here have mid wall split units and it is rarely that you see an wall/window unit, mostly in old houses, but most airconditioner installers dont even do that anymore its just not as efective as a split unit. SO if it is your house why not go for a more effective and engergy efficient Daikin models with inverter motors, they are suppose to be the best.
Regards