Everyone's curious about the big change coming to off-road cabin cooling. Regulations are phasing down the usage of R-134a by 85% by the year 2036. The transition to R-1234yf for heavy-duty vehicles is already underway. As the inventors of Freon,™ Chemours owns and operates the largest R-134a and R-1234yf plants in the world. Trust the refrigerant that's used by the top ten automotive manufacturers. Trust Opteon™ YF.http://info.hotims.com/84504-702