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this increased capacity would have the practical benefit of reduced dependence on lower-efficiency supplementary heating. The size of the heat exchangers for R744 and R410A are basically the same for R410A and R744 in systems designed for comfort. In heating, at a supply air temperature of 40oC, R744 and R410 have approximately the same efficiency for a given indoor coil size. Above a supply air temperature of 40oC, R744 has higher efficiency for a given size heat exchanger (or equivalently, a smaller heat exchanger would have the same efficiency). In cooling, the comfort condition determines the evaporating temperature and the indoor coil size is predominately a function of the airflow rate. In heating if the fan power required to move air over the outdoor coil in the system COP calculation, the optimum airflow over the outdoor coil is around 0.15 kg/s per kW heating capacity for both R410A and R744. In cooling, in terms of system COP there is an optimum for R410A, but not for R744. 42PDF Image | Comparison of R744 and R410A
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