If you really want to know, actually you should now what this means. Here you can find the most comprehensive information on where your Home structure stands in terms of efficiency, and energy usage.

The Residential Energy Services Network’s (RESNET®) mission is to ensure the success of the building energy performance certification industry, set the standards of quality, and increase the opportunity for ownership of high performance buildings. RESNET is a membership 501-C-3 non profit organization.

Check it out here: http://www.natresnet.org/