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HERS Example
HERS (Home Energy Rating System)
| HERS Scale
|
| Points |
Stars |
Energy Consumption |
| 0-39 |
* |
More than 3 x the reference home |
| 40-59 |
** |
More than 2 x and up to 3 x the reference home |
| 60-79 |
*** |
More than 1 x and up to 2 x the reference home |
| 80-85 |
**** |
30% less and up to 60% less than reference home |
| 92-100 |
****+ |
60% less and up to 100% less than reference home |
| Table 1. This scale, developed by
the National Home Energy Rating Systems Council, is based on the U.S.
Department of Energy's national voluntary guidelines for HERS uniformity.
For rating purposes, a subject home is compared to a "reference
home," which scores 80 points on a 100-point scale with a rating
of four stars. Every 5% decrease in the annual energy costs between
the subject home and the reference home increases the subject's home
score by 1 point from 80 points. Meanwhile, every 5% increase reduces
the score by 1 point from 80 points. Note: your state may use a different
HERS and scale. |
HERS Report
An Energy-Effieicnt Home
Estimated Annual Energy Use & Costs
| Description |
|
Energy Use |
Energy Cost |
| |
Space Heating |
23.9% |
21.90 Mbtu |
$110.33 |
| Space Cooling |
33.2% |
30.41 Mbtu |
$588.61 |
| Water Heating |
16.6% |
15.23 Mbtu |
$76.14 |
| Other Energy Uses |
26.3% |
24.12 Mbtu |
$272.36 |
| Total |
100% |
91.66 Mbtu |
$1,047.44 |
Source: National Home Energy &
Resources Organization, Inc.
*Mbtu= 1,000,000 Btu
Table 2. Based on the HERS scale in Table 1 (above), this brand new,
energy-efficient, 3,585 square-foot home in Houston, Texas, received
a score of 89 points and five stars. The home features double-glazed
windows, a 40-gallon natural gas water heater, a natural gas central
air furnace, and an electric central air conditioner. A programmable
thermostat controls the furnace and air conditioner. |
A Home In Need of Energy-Efficient
Improvements
Annual Energy Use & Costs without Improvements
| Description |
|
Energy Use |
Energy Cost |
| |
Space Heating |
78.5% |
233.44 Mbtu |
$1,141.43 |
| Space Cooling |
10.5% |
29.27 Mbtu |
$645.77 |
| Water Heating |
6.2% |
17.60 Mbtu |
$88.02 |
| Other Energy Uses |
4.9% |
13.92 Mbtu |
$265.04 |
| Total |
100% |
284.79 Mbtu |
$2.140.26 |
Estimated Annual Energy Use &
Costs with Improvments
| Description |
|
Energy Use |
Energy Cost |
| |
Space Heating |
58.7% |
63.99 Mbtu |
$326.90 |
| Space Cooling |
12.4% |
13.46 Mbtu |
$291.73 |
| Water Heating |
16.2% |
17.60 Mbtu |
$88.02 |
| Other Energy Uses |
13.92% |
13.92 Mbtu |
$265.04 |
| Total |
100% |
284.79 Mbtu |
$971.69 |
Source: National Home Energy &
Resources Organization, Inc.
*Mbtu= 1,000,000 Btu
Table 4. The homeowner will save more than 50% annually in energy
costs if recommended energy-effiecient improvements are made to the
house in Table 3 (above). These improvements include sealing heating
and cooling ducts, caulking, weatherstripping, installing a more energy-efficient
central cooling system (10 SEER), installing more insulation in the
crawlspace/basement and in the ceiling, and insulating hot water pipes.
Payback for the improvements is estimated at a little more than 4
years. Equivalent carbon-dioxide emissions of 10.88 tons per year.
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