The classic vertically-bored and horizontal-headered heat exchanger for the Buck Institute, Novato, CA. [Courtesy Trison Construction]

(After drilling) Lowering the tremie pipe to begin the grouting process.

Trimming/sealing the U-bend pipe loop after grouting.

A training rig at IGHSPA headquarters demonstrates ground loop bubble removal.

The California Geothermal Heat Pump Association

Welcomes YOU!  

Get connected to the earth in order to save it

Heating, cooling, and hot water 

(from under your 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.