Abstract: Thermal exchange apparatus (1) comprising a primary circuit for circulating a primary thermal carrier fluid, said primary circuit being enclosed in a main body (2) and comprising at least one compressor, means for imposing a temperature change on said primary thermal carrier fluid, an expansion member for said primary thermal carrier fluid and a first heat exchanger, at which said primary thermal carrier fluid undergoes a temperature change opposite in sign. A secondary circuit for circulating a secondary thermal carrier fluid is thermally coupled with said primary circuit at said first heat exchanger, said secondary circuit comprising at least one second heat exchanger (4, 4?) between said secondary thermal carrier fluid and an external body, said second heat exchanger (4, 4?) being external to said main body (2).