Temperature control systems that use the natural insulation of earth and soil are called Geothermal heating systems, and are constructed by burying the structure partly underground. This allows for an energy-efficient structure.
Geothermal temperature control is best suited for residential uses due to most houses’ small amount of volume compared to its surface area. Using the ground as a natural insulator decreases the rate of leakage that often is a problem with small homes.
The ground that surrounds an underground structure acts as a blanket in the winter, retaining heat very well, and as a cooler in the summer, shielding the structure from the sun.
The construction of homes that use underground heating and cooling is not particularly more expensive than conventional homes, as conventional homes would also typically be partly underground.
Underground heating and cooling saves money because less money needs to be invested into insulation upon construction, and more money is saved on energy bills as the temperature retention is usually higher than in conventional homes.
With some specific geothermal designs, conduits are used along the perimeter of the house--also buried--that regulate air flow. These also help the dispersal of air of a desired temperature.
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