A HERS rating, or Home Energy Rating System, is an index to measure how energy-efficient a home is compared to the national average. It was developed by the Residential Energy Services Network, or RESNET and uses a score of 100 as the baseline for the energy efficiency of a typical new home. Most scores range from 0 to 150 with lower scores meaning better efficiency.
For example, a score of 80 would mean the home is 20% more efficient than a typical new home and a score of 120 would mean that the home is 20% less efficient than a standard new home. A score of 0 means that the home is energy-neutral by producing as much energy as it consumes. This could potentially happen though an alternative energy source like solar panels.
HERS ratings are important because they can save you money and increase the value of your home. According to the National Renewable Energy Laboratory, a home with a score of 20 could save you close to $2,000 on your annual energy bills. This kind of savings can increase the amount you could potentially get for your home when it’s time to sell.
HERS assessments are done by certified raters who not only measure the energy-efficiency of the home, but can make recommendations on how to improve the rating. The rater conducts a variety of tests such as a blower door test (to test how much the house leaks) and a duct test (to test how much the ducts leak).
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