this is called convection current
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The convection / subduction cycle.
The process of Convection / subduction current
The reversing valve
The refrigerant is pumped round the system, one way or the other. The warm side is the high-pressure side on one side of the nozzle.
A Reverse cycle Air conditioner is MUCH more efficient than resistance heating. It is called a heat pump, and requires that the Evaporator and Condenser coils of a Closed Refrigerant System be reversed.