How do I install an air conditioner on a horizontal sliding window?
Most of the ones I've seen are install like this with a timber frame made to sit into the window frame then put the air-conditioner inside of the frame and box it out with plywood, but this looks like a much neater installation where the frame is made from c channel with a perspex panel above the airconditioner.



It would probably depended on how long you intend to have the air-conditioner install in the window, as to which option you would go with.