Our bedroom is up on the 3rd floor. The house has central air, but since it's balloon framed you can't really get sizable ducts all the way up. So on days when it's 90 outside the A/C just can't keep the 3rd floor cool enough. When we first moved in we put an old window A/C unit in. It did the job...the only issue was that you can't take it in and out easily. I like to keep the windows open when I can, but once that thing is in you're kinda stuck with it for the summer.
Our second solution was a floor standing A/C unit. Great option...it vents to the window and you can easily open and close the window as needed. The only downside, and it's a big downside, is that it sounds like a freight train when it's running. Loud as hell! Meaning not the best option when you're trying to sleep right next to the thing! I also didn't like that when it was running you couldn't hear anything else going on...especially with the girls bedrooms down below us.
We kicked around the idea of installing a mini-split ductless A/C system for a while and finally pulled the trigger on it a few weeks ago. [Just in time for the 90 degree temps we had!] It's the best of both worlds. You put the condenser outside [so hardly any noise in the bedroom] and you get a super efficient system that can both cool and heat. [A little extra heat up there on those super cold winter nights won't hurt either!]
I spent a lot of time doing research and talking with the regional Mitsubishi rep to figure out the specifics in terms of what model was right for the job and then the logistics of installation. Does the condenser need to be off the ground? How can I run the line-hide so you don't see it on the front of the house? I got the rep to throw in a few extras so that we can control it wirelessly from our phones [just like our other Nest products!]
I'm an architect...you better believe I drew up some plans. Wanted to make sure we got exactly what we wanted.
Out with the old....anyone want to buy it?
I cut an access hole in the knee wall so they could run the refrigerant line up the side of the house, into the knee wall, and then up the face of the gable end of the bedroom. I wanted the line inside at this point instead of seeing it on the front of the house.
These things aren't the cheapest solution out there, but we're already very glad we installed it! Makes a world of difference up there. Even setting it at 80 during the day keeps the humidity down which is really half the battle.