EASY TO INSTALL no drilling or difficult installation process. Just measure the height of your window with the Hybrid AC installed, attach the two panels with the 4 screws to the desired height, install the foam insulation around all four edges, place the panels in the window, and enjoy your view outside! KEEP THE VIEW - With the Horizontal sliding window kit, you can always enjoy the view outside or enjoy the natural light through the high-quality plexiglass while still maintaining the high efficiency of the Hybrid AC unit.