South Street Project,  2008

     showing the closed horizontal loop under our lawn for the new heat pump in our basement.

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Snow covered our geothermal heat and air conditioning system.

But our house retained the warmth beneath for a great winter heating season.

Heat Pump with Temps.

Electric hookup

Core Drilling

Geo Pipe

Site Plans

Estimated Materials Costs

Technical Info

Payback calculation

Frequently Asked Questions

Case Studies

See 42 page continuing education free course written by Peter at


We are so pleased that the installation is complete and the loop is holding pressure.

On Tuesday 5/20/08 we enjoyed the geo heat all day as we watched the price of crude exceed $130 per barrel.

We expect to cut our 1200 gallons per year in half, saving 500 to 600 gallons per year.

(Feb 25 footnote. We are saving at the rate of 500 gals/ yr, having burned only 80 gals for last 25 days to heat upstairs)

This system substitutes for 500 gallons per year wasted up our chimney, and it cuts electric air conditioning in half too.

Mary is pleased with the new system.  Humidity is less, and more air circulates, so we have less indoor pollution.

We received Wetlands Commission approval to dig within 100' of a wetland (under our existing lawn)

The next morning, Thursday, May 15, we installed about 650' of 730 feet of 2" Geothermal pipe, and then completed it Friday.

Here was the lawn before installation:

Orange flags show where loop will be buried.



The 2" diameter pipe loop is buried underground.


The lawn is reseeded and covered with straw.

The lawn is growing back June 11, 2008.

In early April 2010, the system below this lawn has worked great for 2 years.

July, 2010 with air conditioning efficiently handling the heat wave.



March/April 2010 electric bill for 4000 sf electricity with us here almost 24/7 and the heat pump to heat 2000 sf = $122.00 total.

- and this is with no wood burning or solar panels.

This  services the 2000 square foot first floor for cooling and heating,

- replacing the 2 1/2 ton air conditioner, and that portion of our fuel oil boiler that heats downstairs.

Air flow is through our existing duct system. We do not have baseboard radiators.  (Oil still heats upstairs.)

Note that the ground loops are smooth to minimize head loss friction on the circulating pump.

The ground loop does not go near the underground electric lines, the water or sewer lines, near big tree roots, etc.


Remember to see this entire web site by left clicking on the blue text links at the top of this page!

Pete Tavino, PE

Professional Civil Engineer                         Carbon Conscious Consumer or