The invention relates to a reversible device for recovering heat energy by removing and transferring calories from one or more media into any other or more other media. The device comprises at least one compressor (CP1, CP2) and four exchangers (E1, E2, E3, E4), one of the exchangers (E4) being an external exchanger, for example a finned exchanger. According to the invention, the device also comprises at least one auxiliary external exchanger (E4B) making it possible to replace the external exchanger (E4) in order to allow the latter to defrost without interrupting the heat production on other exchangers of the device.
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