We went with the 12000BTU LG unit last year and are very happy with the purchase. Installed in a casement window as well and simply went the cardboard route. Ya, it isnt pretty, but its a quick and cheap method. We intend on looking into plexi or something this year, but cardboard works until then. Just make sure you secure it well- dont want it popping off in the middle of the night and heating up room. A few cons- it is a little noisy, even on low fan mode and does have a bit of vibration when the compressor kicks in. It takes up a lot of space. Not a lot of flexibility in the exhaust hose, so it needs to sit away from the wall by at least a couple feet. Not a big deal if you are talking about a master bedroom that might have more space.
Anyway, it is an affordable and quick solution to cool a single room imo.
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