The Thermal Response Test (TRT) is an essential technical step for any geothermal project using high-power vertical boreholes. It enables a transition from a design based on a literature-based estimate of the subsurface’s thermal characteristics to an optimized design based on in situ physical measurements.
The TRT involves injecting a constant heat input into a test probe for a period of 72 hours. By measuring changes in the heat transfer fluid’s temperature, our engineers determine two fundamental parameters for your project:
the actual ability of the soil at
to transfer heat.
the efficiency of heat transfer between the probe and the surrounding soil.
Geothermaq provides a full range of services to ensure the safety of the preliminary phase of your project.

Reduce your capital costs by avoiding unnecessary
drilling through precise sizing.
01
Make sure the system will meet your heating and cooling (Geocooling) needs over the long term.
02
ADEME requires the completion of a TRT to approve
funding for projects involving more than 1,000 ml
of probes through the Heat Fund.
03
Géothermaq’s services comply with the current ADEME specifications: “cdc-ademe-réalisation-test-réponse-thermique-trt-20200224 Version dated 02/24/2020.”
Our RGE OPQIBI 10.07 certification and our specialization in 100% geothermal energy guarantee you a rigorous interpretation of subsurface data. Drilling, the supply and installation of the test probe, and the TRT measurement may be covered by the ADEME Heat Fund.