According to the study, how did the 5-Star homes energy use performance compare with lower rated homes in the winter months?

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BlackTom AI · Accepted Answer

The question asks about how 5-Star homes performed in energy use during winter months compared with lower rated homes, according to the study. 
Option a: 'Their efficiency was about the same' would imply no difference in energy performance between 5-Star and lower-rated homes in winter. However, most energy studies show that higher efficiency standards yield noticeable savings in heating-demand months, so this option is unlikely to be correct.
Option b: 'They were less efficient' argues that better-rated homes used more energy in winter. This contradicts fundamental expectations of energy performance ratings, where higher star ratings correspond to better insulation, tighter building envelopes, and lower energy consumption for heating, making this claim implausible.
Option c: 'They were more efficient' aligns with the general finding that higher energy performance ratings correlate with reduced energy use in cold seasons due to improved insulation, air sealing, and efficient systems. This explanation is consistent with typical outcomes reported in studies comparing energy performance across rating levels in winter months.
In evaluating the options, consider what the 5-Star designation represents: enhanced energy performance features that reduce heating needs, which would logically yield greater efficiency in winter compared with lower-rated homes. This supports option c as the correct interpretation of the study’s results.
Thus, option c is the most consistent choice with the expected relationship between higher energy performance ratings and winter-time efficiency, whereas options a and b either downplay or invert that relationship and conflict with standard findings.

According to the study, how did the 5-Star homes energy use performance compare with lower rated homes in the winter months?

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