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Answer: energy standards, concerning refrigerants and maintenance carried out by professionals once every five years minimum.
Several types of standards apply to air conditioners. To start with, the energy standards which classify products according to their consumption, the best air conditioners being those of class A. Then there are the standards concerning the refrigerants used, some of which are very harmful for the environment (especially for the ozone layer), but they have since been banned and are gradually being replaced by less dangerous fluids. Finally, only approved professionals are authorized to work on air conditioning systems, in particular when it comes to inspecting or replacing the refrigerant, for the same reasons as those mentioned above. Inspection is mandatory at least once every five years. You too, send us your brico question
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