For an air conditioning unit:

http://www.argos.co.uk/static/Product/partNumber/1816822.htm

"The weather was very warm when I bought it. The photo doesn't show you, but this thing will be linked to a piper where it should exhaust extremely hot air. Exhausting is only possible if you have a suitable place for it. Otherwise you are getting a cool air (of good quality to be honest) on your face (if you adjested to there) and warm air everywhere else. Once you close it, your room is extremely warm, worst if your windows were closed. Also water can't change without buying pipes yourself."

In other words: "Product cannot change laws of physics. 1/5"