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Federal Register / Vol. 86, No. 58 / Monday, March 29, 2021 / Rules and Regulations
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BILLING CODE 351033P

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Cooling Load % of Unit Cooling Capacity
Figure 111-1 Change in EER for Reduced Cooling Loads at 95 F Outdoor Dry-Bulb Temperature, Unit 1
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In Figures III1 and III2, the distance of each data point from the x-axis represents the change in efficiency relative to the full-load efficiency for each unit at the outdoor test condition used.12 The single-speed room AC
efficiency decreases in correlation with a reduction in cooling load, reflecting
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cycling losses that become relatively larger as the cooling load decreases. In contrast, the efficiency of the variablespeed room AC increases as the cooling load decreases, reflecting the lack of cycling losses and inherent improvements in system efficiency associated with lower-capacity
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operation. As explained in the June 2020 NOPR, these results demonstrate that the previous test procedure does not account for significant efficiency gains that variable-speed room ACs can achieve under reduced temperature conditions. 85 FR 35700, 35708 Jun. 11, 2020.

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BILLING CODE 351033C

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Figure 111-2 Change in EER for Reduced Cooling Loads at 82 F Outdoor Dry-Bulb Temperature, Unit 2