There are few choices available for AC units that fit slider windows. Fortunately this is a good quality product from a reputable brand. We live in Florida and bought this as a backup system to run off of the generator when we lose power from hurricanes. Easily cools our bedroom and adjoining bathroom of about 450 SF. It is very heavy, best to have 2 people to lift. Make sure you measure your window height. Our window was too tall for the provided filler panel. I had to make my own filler panel out of plywood and 2x4s ripped to fit into the casement. I also built my own platform because the one provided requires you to drill into the window sill and casement. Overall this is a high quality product and would recommend.  Just read the online installation instructions before purchasing.