4 sider / Air Conditioner & Heater

In general, air conditioner and heater indoor are installed separately, and even a two-way air conditioner is a stand typed or installed on the wall. This is not good for visual and spatial aspects, and it is not energy efficient in the case of on-the-wall installed and at-the-corner installed. It is more efficient to be installed in the center if the room is spacious. For solving this problem, I'm suggesting a two-way air conditioner installed on a ceiling. 4sider is used as a air conditioner with north,south,east and west directions and used as a heater with a diagonal way.