The Panasonic SAVE 4.0 PU Series is a wall-mounted inverter air conditioner utilizing R32 refrigerant. It is available in various horsepower options (1.0HP, 1.5HP, 2.0HP, and 2.5HP). The inverter technology aims for energy efficiency, potentially lowering electricity bills. The use of R32 refrigerant indicates a more environmentally friendly approach compared to older refrigerants.