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heat pump ![click to hear : heat pump click to hear : heat pump](../../images/speaker-vert.gif)
Device exchanging heat between two environments of different temperatures; it can either heat or cool a house, depending on how the circuit is set.
compressor ![click to hear : compressor click to hear : compressor](../../images/speaker-vert.gif)
Device compressing the refrigerant to the desired pressure.
fan ![click to hear : fan click to hear : fan](../../images/speaker-vert.gif)
Propeller-shaped blades drawing in outdoor air (heating mode) or expelling indoor air (cooling mode).
refrigerant tubing ![click to hear : refrigerant tubing click to hear : refrigerant tubing](../../images/speaker-vert.gif)
circuit breaker ![click to hear : circuit breaker click to hear : circuit breaker](../../images/speaker-vert.gif)
Mechanism automatically cutting off the power supply in the event of overload.
outdoor unit ![click to hear : outdoor unit click to hear : outdoor unit](../../images/speaker-vert.gif)
Part of the pump in which, depending on the setting, the outside air is tapped (heating mode) or the indoor air is cooled (cooling mode).