Trying to source a suitable air-con

Last year, during the heatwave, I invested in an air conditioner unit, which gave me about 2 weeks of blissful cool conditions until the electrics burnt out. I was able to send the unit back to Amazon and get a replacement under warranty. 

Sadly, the replacement packed up after 2 weeks. This time I was unable to get it replaced under warranty, because it was deemed to have been used in an unsuitable way, with the exhaust pipe having to have both a steep rise and a sharp turn to get out of the window. This left me out of pocket to the order of about £600.

It turns out that the geometry of the window in my flat could not have been made any more air-con unfriendly, even if it had been deliberately designed as such!

The height of the window, and the fact that the window is hinged at the top, makes it virtually impossible to have an exhaust pipe that will work without overloading the air-conditioner.

My question is what advise would you give to provide a solution that would suit my window?