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Subject Author Date
Gas vs. total electric Bob Dozier 10-18-2006
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Posted by SteveF on October 23, 2006, 9:13 am

>
> sparky wrote:
>> Another angle on the advantage of gas is if you ever go solar or if you
>> run a generator it will cost you alot less as your loads will be alot
>> smaller, significantly!
>
> I'm building in SE tenn. Does anyone havean opinion about heating
> cooling there?
> What is the big expensie to the geo thermo? Is it the gogging and pipe
> layout or the unit it's self?
>
> I'm going woodstove with some kind of heat backup. A/c of course too.
>

The biggest expense to the GSHP is burying the pipe, either in a trench or
vertically in a well hole. For a vertical install a GSHP generally would
need one 150 foot deep hole per ton of system. Around here well drilling is
$8 per foot so the cost mounts pretty quickly.

Steve.



Posted by Raider Bill on October 23, 2006, 1:24 pm
Well, I will have a trac hoe there for my footers, foundation, water
lines etc. And I'm not afraid to use it either!
How deep and long do you suggest? How does that help my hot water
expense?

I plan the house to be a hybrid, 3 courses of block above the floor
line, post and beam filled in with 2X6 conventional framing of
something to be picked later. MAybe SIPS if I learn more about them.


SteveF wrote:
> >
> > sparky wrote:
> >> Another angle on the advantage of gas is if you ever go solar or if you
> >> run a generator it will cost you alot less as your loads will be alot
> >> smaller, significantly!
> >
> > I'm building in SE tenn. Does anyone havean opinion about heating
> > cooling there?
> > What is the big expensie to the geo thermo? Is it the gogging and pipe
> > layout or the unit it's self?
> >
> > I'm going woodstove with some kind of heat backup. A/c of course too.
> >
>
> The biggest expense to the GSHP is burying the pipe, either in a trench or
> vertically in a well hole. For a vertical install a GSHP generally would
> need one 150 foot deep hole per ton of system. Around here well drilling is
> $8 per foot so the cost mounts pretty quickly.
>
> Steve.


Posted by SteveF on October 23, 2006, 7:11 pm

> Well, I will have a trac hoe there for my footers, foundation, water
> lines etc. And I'm not afraid to use it either!
> How deep and long do you suggest? How does that help my hot water
> expense?
>
> I plan the house to be a hybrid, 3 courses of block above the floor
> line, post and beam filled in with 2X6 conventional framing of
> something to be picked later. MAybe SIPS if I learn more about them.
>
>

From the articles I've seen tubing is around 250 to 300 feet per loop with
one loop per ton. One article that buried the tubes in trenches showed
around 8 feet deep but it was maybe 10 feet wide and the tubing was looped
over and over itself so the total trench length was only something like 60 -
80 feet. The biggest problem I found was that in central North Carolina
these systems are not common so it took some work to find someone with the
knowledge and experience to do the install. Call around and find an
installer first and they should be able to give guidance on the tubing
placement.

There are combined HVAC and hot water systems out there but I don't have any
info on them.

I looked at SIPs for my shop but since they are also not common around here
the price was way out of line.

Steve.





Posted by Kay Lancaster on October 24, 2006, 5:42 am
Talk to your local utility company and your local agency concerned with
solar and alternative energy. You may find the combination of tax
breaks and credits bring the cost of ownership down sharply, especially
with rising energy costs looking like a very real possibility.
http://cee.web.mtsu.edu/TSEA.htm
http://www.state.tn.us/ecd/energy_links.htm
http://www.fsec.ucf.edu/EPact-05.htm

You may have to dig a bit... these are some of the offerings in our
state: http://www.oregon.gov/ENERGY/CONS/Federal-Res.shtml
http://www.oregon.gov/ENERGY/CONS/RES/reshome.shtml

Some folks here are reporting payoff on their systems at 10-11 years.

Kay



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