Hers index Scale

Save Energy and Money With a Hubble Home

The HERS Index© can be considered the MPG rating for your home. Among the things that go into determining a home’s energy efficiency are the insulation levels, climate zone, orientation (which direction the homes faces), the number and quality of windows, the HVAC appliances, air leaks in the exterior shell, air leaks in the duct system, and whether or not any kind of renewable energy systems are in place. All of this information is entered into an energy modeling software, which gives the home a HERS© rating score. The lower the HERS© rating score the home receives, the more energy efficient the home is. An average score on the HERS Index© is 100. A score below 100 is better; whereas, on the opposite end of the scale, a score above 100 means a home is less energy efficient.

The bottom line, homes that are more energy efficient are less costly to live in.

HERS© Quick Facts


What is the HERS Index©?

The HERS index© is a numerical rating of a home’s energy efficiency based on the RESNET© Home Energy Rating System energy efficiency scale, which is similar to the MPG for your car.

Who is RESNET©?

The Residential Energy Services Network (RESNET©) is an independent, non-profit organization founded in 1995 to help homeowners reduce the cost of their utility bills by making their homes more energy efficient. This organization developed the Home Energy Rating System (HERS©) Index, a standard of home efficiency recognized by the U.S. Department of Energy, the U.S. Environmental Protection Agency, and the American mortgage industry. RESNET© also trains and certifies HERS© home raters.

How is the HERS Index© measured?

A home’s HERS Index© is determined by a RESNET© certified rater, using standardized procedures developed by RESNET© in collaboration with the U.S. Department of Energy, the U.S. EPA, and the American mortgage industry for inspecting, testing, and conducting a computer analysis of the energy performance of a homes.

Why should I be interested in HERS Index© score for a home?

The HERS Index© score can be used to compare the energy efficiency of homes. The lower the HERS Index© score, the more energy efficient the home. When comparing similar sized homes, a home with a HERS Index© of 80 is 33%* more efficient than a home with a HERS Index© of 120 and would expect to spend 33% less in energy costs.
*A HERS Index© of 120, less a HERS Index© of 80, equals 40 points. 40/120=33.3%

Many appliances are now labeled “Energy Star,” isn’t that enough to lower my energy costs?

Like your car, the more efficient the home, the lower your utility costs will be every year. Just because a home or appliance has an “Energy Star” label doesn’t mean you are going to get the most for your money. The real test for a new home in 21st Century efficiency is the HERS Index©.

What if other homebuilders offer a big list of “efficiency features,” but no HERS© rating?

A big list of features may look good, but will they really save you money? Don’t get lost in the hype. Check the HERS Index© first to really see how efficient the home really is. Don’t put your faith in a list of “efficiency features” without knowing how much you could really end up paying!