www.greenbuildermag.com 04.2012


Category Capital Cost Annual Energy Bill Simple Payback (years)


Initial Design (Good)


$78,180 $1,024 -


Annual CO2 Emissions (tons) 6.2 Basement Walls


Roof Walls R


Windows Heating PV


Triple-Pane R-4 Spray Foam R-30 Spray Foam R-45 Spray Foam R-30


Better


$69,843 $1,014 0


6.2 Spray Foam R-30 Cellulose R-40


2” Spray Foam + 8” 2” Spray Foam + 5”


Cellulose R-30 Double-Pane R-3


Heat Pump HSPF: 8.6 Heat Pump HSPF: 10.9 0


0


Best


$78,841 $365 1.0 5.1


Spray Foam R-15


2” Spray Foam + 8” Cellulose R-40


2” Spray Foam + 5” Cellulose R-30


Double-Pane R-3


Heat Pump HSPF: 10.9 2 kW


55


ANNUAL ENERGY BILL ($) 1,200 6,250


TOTAL ANNUAL BILLS ($)


1,000


6,000


800


5,750


600


5,500


400 Initial Design Better Best


to generate some of our own power and did some further component optimization. In the process, we analyzed nearly 600 different designs and could have analyzed many more.


The final design is slightly more expensive (by $661) than the initial design, but costs significantly less to operate ($659 annual savings), and has a small- er carbon footprint.


HomeSEED results are easily manipulated to pro-


5,250 Initial Design Better Best


duce the best choices, weighted toward the builder or architect’s goal—whether it be saving money, saving energy or code compliance. And because HomeSEED is hosted on a web portal, new components are being added on a regular basis, and there’s no need for end- use software updates. It’s also accessible from anywhere.


For more information, or to test the software visit www.ekotrope.com.

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