The European Standards Organisation CEN is about to issue for public enquiry the proposed revision of the widely used standard for refrigeration systems, EN 378. The changes proposed will have a significant impact on the design and installation of both factory built and site-installed refrigeration, air-conditioning, and heat pump systems. AREA encourages all its members to participate in the enquiry process to promote the role of installers in the clean energy transition ant to ensure that the voice of refrigeration contractors is heard. This Bulletin provides contractor members with key advice on the current standard review and on the inquiry stage.