Re: Cost of eco building
From: Robert (
Date: Sat, 12 Nov 2005 05:04:57 -0800 (PST)
Every house in Eno Commons incorporates a geothermal heat pump and other green technologies.

From, "Advanced Energy did a follow up energy use study which proved that homes at Eno Commons on average used 60% less energy for heating and cooling than the average for homes built in the same time period (using Duke Energy's North Carolina database for 1998-1999)."

I seem to recall the upfront additional expense of a geothermal heat pumps was in the neighborhood of $5K (includes a $2K discount from economies of scale). So the payback period is about 5 years.

-Robert Heinich
Eno Commons Cohousing
Durham, NC
whose geothermal heat pumps are now beyond the payback period and therefore are free

----- Original Message ----- From: <Mlj45 [at]>
To: <cohousing-l [at]>
Sent: Friday, November 11, 2005 7:58 AM
Subject: [C-L]_ Cost of eco building

We are a newly forming co-housing group in Ulster County New York, and we
are currently in the design stage. We are discussing the costs of "building green", installing solar, geo thermal, etc... We are wondering if anyone has any information about balancing out the initial costs of building green, versus
how  long it might take to get back the initial extra investmant in energy
savings. We know, of course, the value of building green, but need some feed back
on the  financial part. Thanks, Lynne James, Ulster County  Co-Housing
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