From what I understand, cold weather air source heat pumps are relatively new to the market, at least in the US. Previously they were designed more for cooling

From what I understand, cold weather air source heat pumps are relatively new to the market, at least in the US. Previously they were designed more for cooling loads and were essentially space heaters with an COP of 1 in cold weather. Many manufactuers seem to offer warm and cold climate models. For example, pulling a random manufactuerer, Mitsubishi brands their cold climate line "Hyper" and specs out much better efficiency down to -13F temperatures.