Refrigerants are essential to multitudes of HVAC&R processes in the commercial sector. Although meant to be contained within various equipment types, their usage inevitably leads to leakage, which may directly contribute to ozone depletion and/or global warming. In response, CO2 rose as a viable alternative in refrigerated beverage vending machines. Simultaneously, federal regulators continue to update minimum/high-efficiency standards for equipment efficiency, and are additionally exploring a proposal for prohibiting certain high-GWP refrigerants. This presentation will discuss the findings of a high-level evaluation, conducted by TTC, on the efficiency and performance of a CO2 vending machine and the applicable standards.