Hopper windows are commonplace. You actually see them almost everywhere. Hopper windows are in many ways very similar to casement windows except that they open in instead of out. This makes it necessary to have their screen fixed outside.
Hopper windows are very energy-efficient. Thanks to their compression seals that allow for lower air leakage, hopper windows, along with casement and even awning windows, are able to keep heat/air conditioning inside while letting other elements out.
One significant advantage of hopper windows aside from their energy efficiency is that you don’t have to worry about sharp corners that can whack you in the head. Also, largely because of how they operate, there’s no chance for leaves, dust, and trash to be blown right into your basement.
Compared to sliders in which only half or even less than half of the window areas can be opened, hopper windows can be opened up to their full capacity improving brightness and air circulation in the room.
Hopper windows feature a small lever handle for ease of operation. Since the handle is also designed to fit into the locking mechanism of the window, it likewise provides improved security. Aside from basement areas, hopper windows are also commonly installed in bathrooms. They are also sometimes found above larger sized windows.