Boessen Underground has been installing geothermal since 1987. Your own backyard has the potential to be an energy source for heating and cooling comfort. Outdoor air temperature fluctuate throughout the year with the changing seasons. In contrast, ground temperatures about four to six feet below the Earth's surface remain relatively moderate and constant. All year round.
Heating and Cooling Cycles
During the heating cycle, the fluid circulates through the loop extracting heat from the ground. The heat energy is transferred to the geothermal unit. The unit compresses the extracted heat to a high temperature and delivers it to your home through a normal duct system or radiant heat system. For cooling the process is simply reversed. Because the earth is much cooler than the air temperature on a hot day, the geothermal system removes heat from the home and deposits it into the ground. The fluid is cooled by the ground temperature and returned to the unit for cooling your home.
Qualifying geothermal heat pump properties installed after December 21, 2008 are eligible for 30% of the installed cost without a cap, as provided under the American Recovery and Reinvestment Tax Act of 2009. The incentive is available for taxpayers installing qualifying equipment at their primary residence or a second home but not for a rental property. This incentive is available until December of 2016.
This loop is used mainly when land area is limited and retrofit applications of existing homes. A drilling rig is used to bore holes at a depth of 150 to 200 feet. A U-shaped coil of high intensity pipe is inserted into the bore hole. The holes are then backfilled with a sealing solution.
This is the most common loop used when adequate land area is available. Excavation equipment such as chain trenchers, backhoes and track hoes are used to dig trenches approximately six to eight feet deep. Trench lengths range from 100 to 200 feet, depending on the loop design and application.
A pond loop is an option if a large body of water is available within approximately 200 feet of the home. A 1/2 acre, eight to ten foot deep body of water is usually adequate to support the average home. The system uses coils of pipe that are typically 300 to 500 feet in length. The coils are placed in and anchored at the bottom of the body of water.
This system can be installed if an abundant supply of high quality well water is available. A typical home will require four to eight gallons of water per minute. A proper discharge area such as a river, drainage ditch, field tile, stream, pond or lake must be present. Check your local codes for restrictions before selecting a specific discharge method.