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Blog
Published: April 30, 2026
Explore new Trane resources that support the proper design and application of central geothermal systems, including system configurations, optimization guidance, and educational tools.
Geothermal HVAC systems have become a popular choice for building owners that want premium efficiency without the need to use gas boilers. Premium efficiency is achieved by using moderate earth temperatures as the heat sink and heat source, instead of the wider range of ambient air temperatures.
Geothermal systems also offer a form of heat recovery, since heat rejected to the ground during the summer cooling months can be used as a source of heat during winter heating months. Gas boilers can be eliminated by using heat pump chillers that provide both cooling and heating capability.
Geothermal systems are used for a wide range of building types, from a 2-ton residential unit to a 10,000-ton campus central plant. The growing interest in larger-scale, central geothermal systems has resulted in new plant configurations and new equipment options.
Trane® has three new resources available to help with the proper design and application of central geothermal systems. These materials are designed for engineers and other HVAC professionals who want to better understand system configurations, controls, and best practices.
In a recently published Trane® Engineers Newsletter (EN), Trane experts describe five common central geothermal system configurations and provide criteria to help select the configuration best suited for a given project. This issue is now available to read or download from trane.com/EN.
Engineers Newsletters are topical, informative articles that provide engineering professionals who design HVAC systems with reliable, objective, and technologically current information in a non-commercial format. They've been published by Trane’s Applications Engineering team since 1972 and have long been a trusted technical resource throughout the industry.
Subjects range from HVAC system configurations to acoustics to interpretation of ASHRAE® standards. They are provided to customers free of charge and you can even subscribe to receive an e-mail notification when a new issue is published.
In addition, the latest Trane® Engineers Newsletter LIVE (ENL) program discusses various geothermal system configurations, with special focus on centralized heat pump plants, borefield layouts, and system optimization.
This ENL features Dan Gentry, John Murphy, and myself (Ben Sykora). A recording of this program is now available to view on-demand from Trane Workday.
Trane ENL is a series of video programs focused on the design and control of HVAC systems, industry issues (sustainability, decarbonization, indoor air quality, acoustics, etc.), or codes and standards. The content is technical and educational, but non-commercial.
The target audience is HVAC system design engineers. However, some programs may also be of interest to others in the industry.
Previous programs are available to view on-demand, and free of charge, in the Trane Workday. In many states, ENL programs meet the requirements for earning Professional Development Hours (PDHs) to help meet the continuing education requirements of your professional engineer license or other certification.
To encourage the proper design and application of central geothermal systems, a newly-revised Trane® application manual, titled Central Geothermal Systems (SYS-APM009D-EN), is now available to download from trane.com.
This manual discusses several configurations of central geothermal systems: refrigerant changeover, hydronic changeover, modular multi-pipe, blended loop, and parallel. For each configuration, this manual describes the primary components, reviews design considerations, explains system operation and control modes, and suggests various system options.
