9.65 feet of exchange pipe per lineal foot of trench using this Slinky® loop.

Geo heat pump equipment never has to defrost like AirSource HPs (From the William Day Company)

Reversing valve makes one piece of HVAC equipment into two—heating OR cooling.

Butt and Socket fusion—homogenous connection, inert to leaks or corrosion.

Butt fusion. Bigger pipe, same method.

Drilling for (thermal) gold. (Air Connection Inc.)

Mixing and pumping grout, your thermal connection to the underground.

Welcome.  Here’s what we offer:

Information on ground source technology  

Events and Training that let you Learn More!

Help yourself and others to:

Carbonless Heating, cooling, hot water 

(from under our feet)

ENGEO leads a Geo Heat Pump Retrofit in San Ramon, CA (3:35)


We strive to turn California’s regulations and policies into green action by government, consumers, and businesses. These include the installation or retrofit of GHPs (geothermal heat pumps) to eliminate greenhouse gas generation by buildings, and to foster their achievement of LEED-certified ratings and a march toward carbonless ZeroNetEnergy, the most sustainable building option of all. Our advocacy is matched with increasing education and training to develop installation professionals and maintain quality standards for evaluation and measurement that prove performance of GHP technology.