Services We Provide
(603) 673-3705 | (603) 880-3012 | (603) 641-9700 | (978) 392-8483 | (978) 348-1991
More recently, even more advanced and efficient heating and cooling systems have
emerged using the than the outdoor air.

Since earth temperature remains relatively constant throughout the year, geoexchange
systems operate more efficiently than air-source heat pumps and generally without the
use of resistance heat. And because they are working from those constant earth
temperatures, there are no blasts of hot air or "cold blow" as with other systems.

Nearly all geoexchange systems on the market have the ability to provide low-cost
domestic hot water, further increasing their operating efficiency. Thus, geoexchange
systems are generally 2.5 to 4 or more times more efficient than resistance heating and
water heating alone, and have no combustion or indoor air pollutants.

Since there is no outdoor unit (as with air-source heat pumps or the central air
conditioners used with combustion-based systems), no weather-related maintenance is

Although their installation cost is somewhat higher due to the required underground
connections for heat transfer to and from the earth, geoexchange systems provide low
operating and maintenance cost and greater comfort.

Types of Loops

Most loops for residential geoexchange systems are installed either horizontally or
vertically in the ground, or submersed in water in a pond or lake. In most cases, the fluid
runs through the loop in a closed system, but open-loop systems may be used where
local codes permit. Each type of loop configuration has its own, unique advantages and
disadvantages, as explained below:
Geothermal Systems
Boston, MA | Baldwinville, MA | Templeton, MA | Winchendon, MA | East Templeton, MA | Waltham, MA |
Winchendon Springs, MA | Westminister, MA | Gardner, MA | Princeton, MA | Ashburnham, MA | East Prinston,
MA | Ashby, MA | Fitchburg, MA | Sterling, MA | Leominster, MA | West Townsend, MA | Lunenburg, MA |
Townsend, MA | Clinton, MA | South Lancaster, MA | Lancaster, MA | Shirley, MA | West Groton, MA | Still River,
MA | Devens, MA | Harvard, MA | Groton, MA | Bolton, MA | Pepperell, MA | Ayer, MA | Stow, MA | Dunstable, MA |
Littleton, MA | Maynard, MA | Westford, MA | Acton, MA | Tyngsboro, MA | Village of Nagog Woods, MA | North
Chelmsford, MA | Carlise, MA | Chelmsford, MA | Lowell, MA | Dracut, MA | North Billerica, MA | Tewksbury, MA |
Methuen, MA | Fitzwilliam, NH | Salem, NH | North Salem, NH | East Derry, NH | Derry, NH | Windham, NH |
Pelham, NH | Merrimack, NH | Auburn, NH | Hudson, NH | Manchester, NH | Nashua, NH | Bedford, NH |
Hollis, NH | Goffstown, NH | Amherst, NH | New Boston, NH | Brookline, NH | Milford, NH | Mont Vernon, NH |
Weare, NH | Greenville, NH | Wilton, NH | Lydeborough, NH | Francestown, NH | Bennington, NH | Greenfield,
NH | New Ipswitch, NH | Temple, NH | West Peterborough, NH | Hancock, NH | Jaffrey, NH | Harrisville, NH |
Dublin, NH
WeatherWise Heating & Air Conditioning, Inc.
65 Route 13 - P.O. Box 337
Brookline, NH  03033
Serving New Hampshire and Massachusetts

Call To Schedule An Appointment:
Brookline:603-673-3705 | Nashua:603-880-3012 |Manchester:  603-641-9700
Westford: 978-392-8483 | Fitchburg: 978-348-1991
Fax:  603-672-5444
Brookline            Nashua             Manchester           Westford           Fitchburg
Horizontal Ground Closed Loops. This configuration is usually the most cost
effective when adequate yard space is available and trenches are easy to dig. Workers
use trenchers or backhoes to dig the trenches three to six feet below the ground, then
Vertical Ground Closed Loops. This type of loop configuration is ideal for homes
where yard space is insufficient to permit horizontal buildings with large heating and
cooling loads, when the Earth is rocky close to the surface, Example of a Vertical Loop
Example of a Horizontal Loop systemlay a series of
parallel plastic pipes. They backfill the trench, taking
care not to allow sharp rocks or debris to damage the
pipes. Fluid runs through the pipe in a closed system. A
typical horizontal loop will be 400 to 600 feet long per ton
of heating and cooling capacity. The pipe may be curled
into a slinky shape in order to fit more of it into shorter
trenches, but while this reduces the amount of land
space needed it may require more pipe. Horizontal
ground loops are easiest to install while a home is under
construction. However, new types of digging equipment
that allow horizontal boring are making it possible to
retrofit geoexchange systems into existing homes with
minimal disturbance to lawns. Horizontal boring machines
can even allow loops to be installed under existing
buildings or driveways.
Open Loop System. This type of loop configuration
is used less frequently, but may be employed
cost-effectively if ground water is plentiful.Example of
a Open Loop system Open loop systems, in fact, are
the simplest to install and have been used
successfully for decades in areas where local codes
permit. In this type of system, ground water from an
aquifer is piped directly from the well to the building,
where it transfers its heat to a heat pump. After it
leaves the building, the water is pumped back into the
same aquifer via a second well--called a discharge
well--located at a suitable distance from the first.
Local environmental officials should be consulted
whenever an open loop system is being considered.
systemor for retrofit applications where minimum
disruption of the landscaping is desired. Contractors
bore vertical holes in the ground 150 to 450 feet
deep. Each hole contains a single loop of pipe with a
U-bend at the bottom. After the pipe is inserted, the
hole is backfilled or grouted. Each vertical pipe is
then connected to a horizontal pipe, which is also
concealed underground. The horizontal pipe then
carries fluid in a closed system to and from the
geoexchange system. Vertical loops are generally
more expensive to install, but require less piping than
horizontal loops because the Earth deeper down is
alternatively cooler in summer and warmer in winter.
Pond Closed Loops. If a home is near a body of surface water, such as a pond or lake,
this type of loop design may be the most economical. The fluid circulates Example of a
Surface Water Loop system through polyethylene piping in a closed system, just as it does
in the ground loops. Typically, workers run the pipe to the water, then submerge long
sections under water. The pipe may be coiled in a slinky shape to fit more of it into a given
amount of space. Geoexchange experts recommend using a pond loop only if the water
level never drops below six to eight feet at its lowest level to assure sufficient heat-transfer
capability. Pond loops used in a closed system result in no adverse impacts on the aquatic
Other loop designs are also being used. In a few places, for example, home builders have
installed large community loops, which are shared by all of the homes in a housing