An all-in-one top 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 top 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 top air outlet type heat pumps are suitable for small spaces, and also for residential or commercial settings where the outdoor unit can be placed on the roof or terrace, and the indoor unit can be placed on a wall or in the ceiling. They are also relatively easy to install and maintain, and can be used for both heating and cooling. They can be more energy efficient because of the integration of the indoor and outdoor units, the efficiency of the heat pump is increased.