Originally Posted by Qtx

Used a 12000 BTU in the bedroom and it was a dream. Died two years two days later, just outside of its warranty which is typical and of course just as it got hot here again.

You really do need to vent the hot exhaust air or they are pointless imo. They do different types of adapters for different styles of windows. Some use velcro to stick on just to cover the gaps so your cold air doesn't escape. There will be an adapter or solution for your type of windows.

Also worth noting that to get the best benefit of them you should close doors so they can chill a room properly or you will never get proper low temperatures.