Home Energy Score Calculation Methodology
A Qualified Assessor calculates the Home Energy Score by first conducting a brief walk-through of the home and collecting approximately 40 data points. Next, the Qualified Assessor uses the Home Energy Scoring Tool to estimate the home's energy use. The Scoring Tool converts it into a Score and develops recommendations for energy improvements. All the data required to calculate the Home Energy Score is listed in the Data Collection Sheet.
The calculation method holds a number of variables constant. For example, it assumes, that the thermostat is set at specific levels at various points of the year, and that homeowners use appliances in a standard way. By holding these other variables constant, the Home Energy Score allows consumers to compare homes on an equal basis, putting aside the effect of homeowner behavior.
The Home Energy Scoring Tool estimates the likely energy consumption of a home, and converts that into a Score on a scale of 1 to 10. Homes that are expected to use the least amount of energy score a 10, and homes that are expected to use the most amount of energy score 1. The energy range underlying the scale varies from region to region to account for differences in climate. For example, given that a home in Minneapolis is likely to use more energy than a home in San Diego, the points on the scale correspond to much higher energy values in Minneapolis than in San Diego. To score an 8, a home in Minneapolis can use up to 195 Million British Thermal Units (MBTUs); whereas, a home in San Diego can only use up to 119 MBTUs.
See how energy levels translate into points on the scale in each of more than 240 climate regions by viewing Home Energy Score—Energy Usage Points.
As of November 24, 2013
April 23, 2013
March 27, 2013
February 4-6, 2014
February 24-26, 2014