Year after year energy prices are on the rise along with our concern about using renewable resources. The resources of our planet are not limitless, and as we use these resources, we must consider their impact on the environment both now and in the future.
Residential geothermal heating and cooling provides an answer to both of these concerns. The term geothermal means heat from the earth. Both near the surface and deep within the ground, our planet can provide a continuous source of heat and energy. However, we use the term geothermal to describe two entirely different forms of energy.
Geothermal energy describes the use of heat within the core of the earth. Heat extracted from the magma far below the ground provides an environmentally friendly way to power the turbines of a power plant.
Residential geothermal heating and cooling describes the use of energy closer to the surface also called ground source energy. It relies on geothermal technology to provide a sustainable source of energy to heat and cool our homes. Geothermal heating and geothermal energy are proven technologies whose use continues to grow worldwide. In the long run, this use will lower dependence on fossil fuels and save us money.
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Over one million homes in the United States today use geothermal heating and cooling installations. In fact, the US Environmental Protection Agency considers geothermal heating and cooling the cleanest and most energy efficient system of conditioning any home.
Geothermal systems benefit from the earth’s ability to store solar energy. Mild heat exists in steady supply at depths ranging from six feet to a few hundred feet below the surface of the earth. A residential geothermal system efficiently uses this heat source to both heat and cool homes.
Geothermal Heat Pump
The heat pump is a device which transfers heat from one source to another. In some systems this heat is created using water drawn from a nearby well. In other types, a fluid mix is circulated through shallow ground or a pond outside the house absorbing the mild temperatures from which heat can be extracted. During the warmer months, the heat pump reverses using water to transfer heat back into the ground to help with cooling. Because the heat pump transfers heat rather than creating it through combustion, efficiencies are much higher. Heat pumps are estimated to be four times more efficient than fuel burning furnaces, making them far less expensive to operate.
Geothermal Systems are Long Lasting
Geothermal heat pump systems are also a long lasting source of heating and cooling. Overall, the system contains far fewer moving parts than a conventional system. The average ground source heat pump will last approximately 25 years, twice the life expectancy of most fuel burning systems.
Closed Loop - With a closed loop geothermal system, a special type of antifreeze solution is pumped continuously through underground piping, absorbing mild temperatures from the earth or a pond and transferring it to the home. These loops of tubing can be run either horizontally at depths of six to eight feet or vertically to a depth of a few hundred feet. The choice of using a horizontal or vertical system will depend on the availability of space and the cost of installation, although a vertical system is generally more expensive.
Open Loop - An open loop geothermal system uses water pumped through the system from a drilled well. Heat is then extracted from the water before it is discharged back to the source. A consistant supply of good, quality water is most important to the open loop geothermal system.