R-134a vs R-1234yf: Which AC Machine Does Your Shop Need?
R-134a and R-1234yf are not interchangeable, and neither are the machines that service them. The fittings differ by design, R-1234yf is mildly flammable so its equipment is built to a different safety standard, and the two refrigerants fall under separate SAE certifications. This guide breaks down the five differences that matter at the service cart, decodes SAE J2788, J2843, J2851, and J3030, and gives you a way to pick a machine off your actual ticket mix. It also covers why flushing a single-refrigerant machine is not a workaround, and what buying wrong actually costs.