Range The FAIRY model comes in a range of 12,000BTU, 18,000BTU and 24,000BTU. The 24,000BTU is capable to go up to 29,000BTU on cooling and 34,000BTU on heating due to a higher air flow volume. Refrigerant R-32 is a next generation refrigerant that efficiently carries heat and has lower environmental impact. Inverter An Inverter is a new system in the AC’s that when the AC reaches its temperature, the system slows down using less electricity with less consumption and it keeps your room at the preferred temperature. WIFI With the WIFI Function you can turn the unit on with your smart phone when you are in another location.