Colin Bates low-temperature air source heat pump unit is a central air conditioning unit that uses air as the cold and heat source, and water as the heat transfer medium. This unit can be combined with fan coil units, air conditioning units, etc. to form a centralized air conditioning system, achieving summer cooling and winter heating. The unit adopts modular design, which is widely applicable to new and renovated industrial and civil construction projects, especially in places without centralized heating, such as highway toll stations, hotels, factories, apartments, animal husbandry, agricultural greenhouses, etc. The end can be connected to fan coils, underfloor heating, etc.