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103% Increase in the Number of HERS Rated Net Zero Energy Homes from 2013 to 2015

Feb 18, 2016

The number of net zero energy homes nationally that were HERS rated skyrocketed from 91 in 2013 to 185 in 2015.  There were 122 homes HERS rated as net zero energy homes in 2014.

The average HERS Index score of net zero energy homes rated in 2015 was -7.  The following is a comparison of net zero HERS rated homes from 2013 to 2015:

Year

Number of Homes HERS Rated as Net Zero Energy

Average HERS Index Score for

Net Zero Energy Homes

Lowest HERS Index Score for

Net Zero Energy Homes

2013

91

-6

-63

2014

122

-7

-48

2015

185

-7

-57

In 2015 the five leading states which produced net zero energy homes were:

  • New York                   (81 homes – average HERS Index score: -7)
  • Florida                        (26 homes – average HERS Index score: -7)
  • Nevada                      (12 homes – average HERS Index score – 4)
  • Colorado                    (12 homes – average HERS Index score – 8)
  • Massachusetts         (11 homes – average HERS Index score – 8)

The home with the lowest HERS Index score in 2015 was in Maine with a score of -57.  This meant that the home will generate 57% more energy onsite than it will consume.

The following is a breakdown of net zero energy HERS rated homes in 2015 by state:

State

Number of Homes Rated as

Net Zero Energy

Average HERS Index Score for

Net Zero Energy Homes

Lowest HERS Index Score for

Net Zero Energy Homes

Arizona

7

-5

-20

Colorado

12

-8

-23

Connecticut

8

-8

-15

Florida

26

-7

-24

Hawaii

1

-9

-9

Indiana

1

-3

-3

Kansas

1

0

0

Maine

2

-35

-57

Maryland

2

-2

-4

Minnesota

2

-12

-17

Nevada

12

-4

-18

New Mexico

1

-24

-24

New York

81

-7

-17

Rhode Island

4

-2

-5

Texas

1

-3

-3

Vermont

4

-5

-7

Virginia

5

0

-2

Washington

3

-4

-13

Wisconsin

1

-2

-2

US Total

185

-7

-57

The RESNET HERS Index is a relative measurement of the energy performance of a home. 100 on the HERS Index represents a home built in 2006.  A score of 0 represents a net zero energy home that produces as much onsite energy as it consumes.  The average HERS Index score in 2015 was 62.

 

The data is from the RESNET Registry of all of the homes that were HERS rated in the U.S. in 2013, 2014 and 2015.

The 2016 RESNET Building Performance Conference will feature a special track on “From ENERGY STAR to Zero Energy Home and Beyond”.  For more information on the conference go to 2016 RESNET Building Performance Conference