An all-in-one side air outlet type heat pump is a type of air-source heat pump that combines the outdoor unit and indoor unit into one compact package. This type of heat pump typically has the compressor, evaporator, and condenser all located in the outdoor unit and the air outlet on the side of the unit. This design allows for easy installation, as it eliminates the need for separate outdoor and indoor units and the associated ductwork and refrigerant lines.

The all-in-one side air outlet type heat pumps are more suitable for small spaces and they are more energy efficient because of the integration of the indoor and outdoor units, the efficiency of the heat pump is increased. They are also relatively easy to install and maintain, and can be used for both heating and cooling.