Raising your projected energy saving is the key to raising your rebate, because ...
The annual energy savings generated by the set of improvements is directly the job of specially designed and tested Energy Modelling Software. A rater's audit begins with the collection of data from either plans, when a new home is qualifying for the HERO program, or by an extensive visit to the home, when an existing home is qualifying for the HERO program. These data are then input into the software so it can calculate a projected annual energy bill. When two home models are compared, one before improvements are made and one after, the difference in the projected annual energy bill can also be calculated; this difference is called the annual energy savings.
The Life of the improvements is the weighted sum of all of the energy improvements which can contribute to a rating.
( Since the HERO program is a part of a national program of HOME ENERGY RATING SYSTEMs, it must conform to national guidelines. The authors of these guidelines have only found concensus for ways to treat and utilize a limited set of improvements that can affect an energy bill. Fortunately for homeowners, the set of improvements that can affect a rating contains most of the improvements that are commonly used around the country. However, notably absent are excellent energy savings measures like: fluorescent lighting, using ceiling fans, abandoning attic fans, properly installing exhaust fans, and dedicated year-round dehumidification equipment, etc. But as you'll see from the list below, what IS included is most of what is most commonly done to lower residential energy use. )
The calculation of the weighted sum of all of the energy improvements uses the actual (or differential for a new home) cost of the improvements and the following times:
Calculating Blended Weighted Life for Upgraded Equipment
When a single component is installed on an existing home (use these values)
Calculating Blended Weighted Life for Upgraded Equipment on an existing home
(Useful Life a X $a) + (Useful Life b X $b) + (Useful Life c X $c)
$a + $b + $c
EXAMPLE : a) INSULATION b) INFILTRATION c) HOT WATER HEATER (on an existing home)
(30 X $1200) + (30 X $300) + (15 X $500) =
$1200 + $300 + $500
36000 + 9000 + 7500 =
1200 + 300 + 500
26.25 years =
In the above example, if a homeowner also installed fluorescent lighting in the home, the annual energy bill would go down, but the weighted life of the set of improvements would not be affected. So such an improvement CAN affect the size of the rebate, but not as directly as one of the nine choices given above.
On a new home a 20 year life on equipment can be used in lieu of performing the Blended Weighted Life Calculation.