[6510]

If the bottom of the window is 80cm or less from the floor you need safety glass. Therefore most windows are much further from the floor than that tube can reach. We also have very few sliding windows that allow such neat finish. A lot open at the top. Many turn left or right and are half the size of a door (because there is no AC) Running a crappy tiny portable single hose AC with the window open doesn't do much. Extra fun if you have roller shutters (for shade) with windows that open outwards.

[plorkyeran]

The tube for my portable AC unit would quite easily reach the ~250cm to the tops of my windows and it is not unusually long. I'm not sure what makes you think that would be a problem.

[hparadiz]

Duct tape and card board is your friend. Get creative.

[6510]

right, but first have to wait for the wife to overheat enough to allow it.