Low-GWP Tool is now part of the new Ref Tools app, our essential, all-in-one mobile app for air conditioning and refrigeration technicians. Ref Tools gives you access to the tools, guidance, support, and information you need—on the job and in the field. Download Ref Tools to access the latest version of Low-GWP Tool. Retrofitting refrigeration systems to more climate-friendly refrigerants is much easier with the right tools in hand—and the first one you should reach for is Low-GWP Tool.