Lots of people do not understand how to prepare a window air conditioner and for that reason just allow their offices or homes to stay sweltering through the summer.
casement air conditioners are great since they're the least invasive ac systems to set up and can very easily be turned off or removed as is required. They're easy to install and should have descriptive directions and graphs.
However, not all instructions give little hints and tricks. The first thing you should do is be sure to put in it throughout the day. Daylight will make it much easier to see what you're doing so it doesn't fall from the window, and additionally, it will prevent bugs from entering the window is open.
Have everything ready and laid out until you've unpacked. Have the screen taken out of the window. Bear in mind that these only work for windows which may be pulled up. Open up the window to give yourself a little more room to work. It's helpful if you have somebody there to push the top sash once the time comes.
Make sure that the air conditioner is facing the correct way. Front, which should be within the space, should have the dials and the cord to plug in the wall.
The back, the part that hangs out, should have the vents where water will trickle out. Carefully put it on the window sill, facing the correct way. There ought to be ridges around the outside of the air conditioner to demonstrate where it must line up with the window.