How does a HERS Rater assess a home's energy performance?

A HERS Rater assesses a home's energy performance by using specialized tools and techniques, including blower door tests. These tests are essential for measuring the air leakage in a home, which contributes significantly to energy loss. The blower door test involves using a fan to create a pressure difference between the inside of the home and the outside, allowing the rater to determine how much air is escaping through various leaks. This quantitative measurement provides critical data that helps in evaluating the overall energy efficiency of the building.

Additionally, the HERS Rater employs various other tools, such as infrared cameras, to detect thermal leaks and assess insulation effectiveness, as well as software models to analyze the data collected. These techniques offer a comprehensive assessment of a home's energy performance, leading to more informed recommendations for improvements. By relying on specialized instruments and methods rather than subjective judgments, the HERS Rater ensures a thorough and accurate evaluation of the home's energy efficiency.