Greenhouse gas potential is found by multiplying the charge of a system by the GWP of the refrigerant in the system. Walmart as a whole has set a goal to reach zero emissions by 2040 across its HVAC and refrigeration systems by transitioning to "low-impact refrigerants," said Payerli, adding, "we do not plan to use carbon offsets." No impact on customer Payerli indicated that Sam's Club converted "a large portion" of the 136,000ft 2 (12,635m 2 ) Palmdale location, which includes 30 cases and 11 walk-in rooms in total, from an HFC system to the new transcritical CO 2 system. Importantly, the conversion was designed so that it would not impact the customer's experience or close the club.