Re: OT: Heat pumps

On Dec 24, 6:40 pm, Bob <bobkap...@xxxxxxxxx> wrote:
On Dec 23, 1:55 pm, "John E. Malmberg" <wb8...@xxxxxxxxxxx> wrote:



I am now in central Illinois.

I had aheatpump installed when I was in middle Tennessee.  In that
area of Tennessee, drilling or digging deep usually means blasting, or
other expensive methods, so using a deep ground source is expensive.

The house originally had electric elementheatand an air conditioner,
as it was built when the TVA (a mostly hydro system) was new and
electric rates were cheap.

The climate in Tennessee is such thatheatpumpsperform well for all
but two to three months of the heating season when the temperature gets
too cold.

My current house and and previous New Hampshire one have high efficiency
gasheatwith separate air conditioners.  It would take beyond the
expected life of aheatpump to get a payback for the savings for the
few times a year that it was cold enough to needheat, but warm enough
so that it was cheaper to run theheatpump.  A lot of that depends on
the relative price of fuel.

That's what I ran into this year. I'm in the Chicago area. Needed to
replace the house's original furnace and A/C. I wanted to go
GeoThermal (ground loop heat pump), but those systems cost $30-45K to
install vs $8K for a top of the line high efficiency gas furnace and
electric AC. Back in 1989 when I was still working for DEC we built a
super insulated passive solar house. For a 2800 ft^2 house, the
biggest heat bill we've ever had as $140/mo, and the biggest AC bill
slightly less. I calculated my TOTAL annual heat and AC combined cost
at around $1000. Even if cut in half, the GeoThermal system just
wouldn't pay for itself. So we ended up with the conventional system,
similar to the original units from 20 years ago.

Cost really depends upon many things including loop type and the
difficultly involved in installing the loop. (very easy in a new
subdivision or rural location; more expensive in an established
subdivision). That said, I remember the typical residential
installation coming in around 12k.

Neil Rieck
Kitchener/Waterloo/Cambridge,
Ontario, Canada.
http://www3.sympatico.ca/n.rieck/links/earth_systems_alumni.html
.

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