The Panasonic BZ wall mounted offers a range of high wall air conditioner and heat pump systems that use the environmentally friendly R32 refrigerant gas. These simplistic looking units can be controlled by the standard handheld remote provided, or can be controlled by Wi-Fi (with the purchase of a Wi-Fi adaptor). There are 4 units in this range; a 2.5kw, 3.5kw, 5kw and a 6kw unit.