How to install a window A/C unit?

[98MustGT]

I need A/C in the house, my windows slide left to right. The A/C kit says its for windows that go up and down.
Also how does the unti stay in the window?

[SeVeReDiStOrTiOn]

As far as I know it only works for the up and down windows like you said...basically you just put the unit on the bottom of the window frame, close the window on top of the unit. There's some holes for screws so someone can't just pull the a/c out and crawl in the window...the unit will also have plastic/metal shutters that closes the gaps on the sides of the unit.

[IHSS]

They make them for the windows that slide side to side but they are not as common so you have to call around to find a place that stocks them.