Geothermal Cooling

How Geothermal Works

When the outside air temperature is 95 degrees, just a few feet below the ground, the temperature is about 72 degrees.  Air conditioning systems cool the air before blowing it through the building.  Starting with a temperature of 72 degrees instead of 95 degrees makes a lot of sense.  This is geothermal cooling.

Using the Earth

  • Air temperature goes up and down throughout the year
    • But underground temperatures remain relatively constant
  • Air conditioners work by exchanging hot air for cold
  • Conventional systems use the outside air which is hotter than the ground
  • Geothermal sytems use a buried loop of  piping containing fluid that circulates through the pipes
  • In winter, the fluid takes in heat from the earth, then transports it to the indoor unit to be sent through the building
  • In summer, the process reverses
    • Takes in heat from the building
    • Sends it out to the surrounding ground


Geothermal Systems

  • Typically no outdoor unit
    • Increases longevity of equipment as it is not exposed to the elements
    • Lasts 2 to 3 times longer than conventional systems
  • Reduces energy costs ranging from 30-60%
  • Low maintenance


Types of Geothermal Systems

Closed Loop Systems

  • Water used for heat exchange Is contained within the system
  • Types include horizontal loop, vertical loop, and pond/lake loop

vertical loop

Open Loop Systems

  • Water used for heat exchange is “open” to the environment
  • Used when available land space is limited


open loop


The best type of geothermal loop system to use depends on the existing property, available ground space, and existing structures and driveways, parking areas, etc.  Each type works well, and regardless of the type, geothermal cooling, heating, and pool heating is extremely efficient.  For saving energy costs, it can’t be beat.