Re: Gas or heat pump in Midwest?
- From: dpb <none@xxxxxxx>
- Date: Wed, 10 Oct 2007 15:34:07 -0500
Steven Andrade wrote:
On Wed, 10 Oct 2007 11:07:37 -0500, "Pete C." <aux3.DOH.4@xxxxxxxx> wrote:I plan to install a ground source heat pump when I replace my HVAC
eventually. One thing to keep in mind is that there are several ways to
install the ground loop and some installers are still pushing the
somewhat obsolete and much more expensive drilled vertical loop
installation or long loop horizontal installations. The newer trenched
vertical coil type installation is much cheaper to install and has been
proven to be equally efficient as the older methods. The trenched
vertical coil method cuts a narrow trench to a suitable depth and then
installs the loop piping like a flattened stretched out slinky.
I've read about such systems but have never seen one installed. Is it a major
task involved to bury the loop? How long, large, and deep is the trench?
Depends... :)
On how much capacity you need, where you are, type used...
In most locations you'll want it at a bare minimum of 4-ft and it should be 6-ft or so to minimize the thermal swings (winter _and_ summer).
For a ranch w/ fully furnished basement of roughly 1700 sq-ft per level, we had about 400 lin-ft of trench in E TN. As noted, there are some newer techniques since then that may cut down the actual size needed.
I personally recommend talk to your local Water Furnace distributor. At the time we did ours (15 years ago now, almost!!!) Oklahoma State had the recognized best collection information source out there along w/ TVA. I've not looked recently to see, but I'd start there.
It cut our heating/cooling costs by nearly two-thirds over the air/air unit it replaced...
We moved in '99, but just a year or two ago another friend in the neighborhood still mentioned via e-mail he had seen the fella' who had bought the house and asked and the unit was still fine w/ no maintenance.
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- From: Steven Andrade
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- From: dpb
- Re: Gas or heat pump in Midwest?
- From: Pete C.
- Re: Gas or heat pump in Midwest?
- From: Steven Andrade
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