This and this are our Varipool Forth and Beyond heat pump Very cost-effective one , and it can be use on Heating homes and swimming pools. The working temperature range is -10~43 degrees Celsius. If the winter is not very cold , using it will be a good choice. It uses R32 refrigerant, a safe and environmentally friendly refrigerant. It has a simple control system ,12 operating modes and can be controlled through a mobile smart app. Classic Positioning Full Inverter Technology Silent Running High Efficiency Running Air Temp. -10°C~43°C R32 & R410A for Option Intelligent Defrosting Built-in Wi-Fi for Smart APP Control