I don't know if you have looked at units that are easily to install in wall. We have one and it is called a High Wall split system. We have bought 6 in our family. ( our kids homes) We live in the country and didn't want the expence of central air. These units can be seen at WWW.genieairconditiong.com We have had a GE for over 10 years now and we have several Soleus Brand. The loud part of the unit sits outside(so it is quiet) and looks like a suitcase ( a little bigger than, but not much). Our last one was 600 dollars and our 1st one 1000 dollars. They are getting to be well known now in the US. I saw them for the first time In Paris in our hotel room. Check it out. doesn't cost a thing to look. It is easy to install. It doesn't cost much to run. I use mine and cool in a 4 bedroom house and my electric only went up about 10 dollars a month in the hottest part of the summer. Good Luck :-)