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The effect of energy policies on the energy performance of residential properties/houses in nineteen Portuguese districts from 2014 to 2021 was investigated. A linear random-effects model regression was used as the method in this empirical investigation. The empirical results indicated that the income per capita has a negative effect on residential properties with high energy efficiency certificates (e.g., <b>A+</b>, <b>A</b>, and <b>B</b>) and a positive impact on residential properties with low energy efficiency certificates (e.g., <b>C</b>, <b>D</b>, <b>E</b>, and <b>F</b>); the codes and standards energy policies for energy efficiency have a positive effect on residential properties with high energy efficiency certificates (e.g., <b>A</b>, <b>B</b>, and <b>B−</b>) and residential properties with low energy efficiency certificates (e.g., <b>C</b>, <b>D</b>, <b>E</b>, and <b>F</b>); the fiscal and financial incentive policies for energy efficiency have a positive effect on residential properties with high energy efficiency certificates (e.g., <b>A+</b>, <b>A</b>, and <b>B</b>) and a negative effect on residential properties with B− energy certificate, and also a negative effect on residential properties with low energy efficiency certificates (e.g., <b>C</b> and <b>D</b>) and a positive effect on residential properties with an F energy certificate; the information and education policies of energy efficiency have a positive effect on residential properties with high energy efficiency certificates (e.g., <b>A+</b>, <b>A</b>, and <b>B</b>) and residential properties with low energy efficiency certificates (e.g., <b>C</b>, <b>D</b>, and <b>E</b>); and, finally, the consumer credit per capita has a positive effect on residential properties with high energy efficiency certificates (e.g., <b>A+</b>, <b>A</b>, and <b>B</b>) and a negative effect on residential properties with low energy efficiency certificates (e.g., <b>C</b>, <b>D</b>, and <b>F</b>), as well as a positive effect on residential properties with an F energy certificate.