12K BTU is too large for a bedroom unless it's a very large bedroom. It will cool the area very quickly and not run enough to dehumidify unless the temp is set very cold.

It's difficult to get airflow from a single window unit circulated evenly through multiple rooms unless the layout is conducive to it and the unit is located accordingly.

It seems like the 12K unit would be very aggressive in the bedroom, though its effectiveness depends on the insulation of the room, and weather. It could work well only for the hottest weeks of summer.

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If you think that it will be more appropriate through the last year experience then you should go for it. keeping the other space cool with the bedroom air conditioner asks for more BTUs,

There is no harm in trying what you are proposing. You know you will sleep comfortably at night which is important to most people. You could buy a floor standing fan for the living room to try to circulate some of the air from the bedroom.

If you buy a floor fan, I would not recommend using it while sleeping. The sounds it makes can make you sleep poorly. Also, the use of such a solution together with open windows can lead to various diseases. I believe that the best solution to this problem would be to install a full-fledged air conditioner, but if this is not possible, then you should pay attention to a portable air conditioner. I personally use a similar solution in my apartment. The apartment is not big, so he does his job well. If you don't know which one to choose, then read this article https://bestbudget.com/home/smart/portable-air-conditioner/. Hope this helps you. Good luck!

There are a large number of things that can influence how a forced air system performs dependent on its position - maybe such a large number of for it to be an accurate science. Cool air will constantly sink to the lower part of a room, and except if you're enhancing the climate control system with a fan to course it around the room, introducing it higher will help cool the room all the more equally. In case you're just introducing a solitary climate control system unit, consider where it will be generally valuable. The open air units of split framework forced air systems are by and large introduced against the external mass of the room being cooled, however a reasonably qualified and authorized installer will have the option to bring up the best area for every circumstance. Outside units ought to be mounted in stable spots where they won't vibrate, where they have a lot of free space on one or the other side to permit wind current, where they're effectively available for support, and where they aren't probably going to be presented to destructive substances. On the off chance that you have open-plan living zones, fans ought to be introduced over the focal point of parlor, cooking or feasting territories. Again, the situating of fans is never off-base given that they're coursing air around you and others in the room. There is also an option for a standing ac which takes less space and works perfectly fine.

What about installing a mini split?