R-744 systems require about half the refrigerant capacity of current R-134a systems.

Name: R-744 systems require about half the refrigerant capacity of current R-134a systems.
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R-744, also known as carbon dioxide, has a much higher volumetric efficiency than R-134a. This means that R-744 systems require less refrigerant to achieve the same cooling capacity as R-134a systems, typically around half the refrigerant capacity.

R-744 Systems Require About Half the Refrigerant Capacity of Current