Case Studies

See what interests you from our collection of case studies

Geothermal Case Studies

Case studies are 8.5×11″ front and back information sheets describing specific geothermal installations. The information includes a description of the project, size and design of the geothermal system, a list of the energy savings and other benefits, and a photograph of the building.

These case studies are available as a readable PDF document. You must have Adobe Acrobat Reader to view these documents. Reader is free to download from Adobe’s website.

NGWA Headquarters, Westerville, OH

NGWA (National Ground Water Association) broke ground on a geothermal retrofit at its headquarters on August 22, 2023, in Westerville, Ohio. Utilizing the geothermal tax credits available for nonprofit organizations that were signed into law in 2022, NGWA is replacing 9 furnaces, 9 air conditioners, and a mini split with 9 geothermal units. Ductwork and other modifications will be made to improve comfort and better utilize the building’s HVAC system. Many industry stakeholders came together for this renovation, including IGSHPA and NGWA members and suppliers of equipment, pipe, and other system components. An IGSHPA member engineering firm even provided discounted pricing for design of the system. This project is a great example of how retrofit applications can work well and be good business for well water and geothermal contractors, engineering firms, and building owners.
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Park Chase Apartments, Tulsa, OK

Park Chase Apartments spreads out over 27 acres and consists of 64 buildings containing 348 apartments. It was renovated beginning in 1991, and the GHP retrofit is currently saving the US Department of Housing and Urban Development (HUD) close to $60,000 annually. This case study tells the story of how HUD came to select a GHP retrofit, how contractors and the local utility worked to lower first costs, and the benefits the complex has gained from putting in a GHP system .
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Fort Polk

At Fort Polk, the installation of over 4,000 GHPs has enabled US Army energy managers to reduce energy and maintenance costs while avoiding cuts in service or salaries on the base. The $18-million contract was signed in 1994, and the project was completed in 1996. This case study describes the extent of the retrofit project, the benefits gained from the GHP system, and how financing was managed through a shared energy savings contract.
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Galt House

Completed in 1984, the Galt House East Hotel consists of 600 hotel rooms, 100 apartments, and an additional 120,000 square feet pf public area. Combined with the Waterfront Office Building (960,000 square feet), the complex represents over 4,700 tons, making it the largest GHP system in the world. This case study describes the project and its cost, system design, and the benefits of the GHP system. 
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