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HERS (Home Energy Rating System) Ratings

Ever wondered how efficient your home is compared to other homes of the same size?

It may sound crazy, but there is a way to find out!

Having a Building Performance Auditor (BPA) come into your home and conduct a home energy audit can not only let you see how your home can potentially improve, but can also give you a way to measure your efficiency compared to a home of a similar size and standard usage patterns by way of a HERS (Home Energy Rating System).

What is a HERS rating? Calculated from 1 to 150, a HERS rating shows you how much energy your home uses in comparison to other homes. The lower your HERS score, the more efficient your home (a home with a rating of 0 means that the home produces the same amount of energy it expends). 

To calculate a HERS index, an auditor enters data about the home into a computerized simulation analysis utilizing RESNET Accredited Rating Software to calculate a rating score on the HERS Index

An auditor takes down information about a home and enters the data into RESNET (Residential Energy Services Network) software, including its shape and size. The software will calculate typical usage patterns for a home of the same shape and size, giving the software a base from which to calculate.

A common misconception is that a new home is more energy efficient than a home which has been treated with energy efficient products. Actually, a standard new home has a HERS rating of about 100, while a home which is ENERGY STAR certified has an average score of about 85. This means that an ENERGY STAR certified home is about 15 percent more efficient than a standard home of its shape and size. For every 1 percent more efficient a home is than the standard home of that shape and size, 1 point is deducted from its HERS index. Likewise, for every 1 percent less efficient a home is than the standard home of that shape and size, 1 point is added to its HERS index. Despite being the opposite of conventional logic, it is better to have a HERS rating of 65 than one of 125.

You need not invest in a new home to improve your energy efficiency and increase your quality of living. By calculating your HERS index and making cost-effective improvements, you will be able to:

  • See what spots in your house are problematic. Even places that don't seem to be an issue can be leaking away valuable dollars that could easily be saved.
  • Increase your home's resale value. Homes that are ENERGY STAR certified have state-of-the-art equipment. It requires little effort to waste energy; on the contrary, a little more awareness and newer products can make a big difference when it comes time to sell.
  • Give you better comfort and peace of mind! What better reason to make improvements than to increase your standard of living? After all, it is your house and you want it to be comfortable!