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Energy·researched

Geothermal & Ground Loops

Why it matters

Two metres under any meadow, the temperature holds at 8–12 °C all year. It stays indifferent to whether the surface bakes at +25 or cracks at −20. For a heat pump, that steadiness is gold: no icing, no defrost cycles, no winter collapse. The COP stays at 4–5 straight through the season that breaks air-source machines. Of everything heating physics offers, geothermal comes closest to cheating winter. And contrary to its exotic reputation, the horizontal version is disarmingly low-tech: polyethylene pipe in excavator trenches at frost depth, food-grade antifreeze in a sealed loop, nothing entering the soil. Yet our own decision journey teaches the larger lesson: logistics and values still have to confirm the technically superior option. This page exists as much for the reversal as for the physics.

Role in 001's holistic picture

Geothermal is the heat pump's most stable source. For Unity Hub we evaluated that road in depth and chose another. The evaluation touches surprising neighbours: aquifer ethics (borehole drilling raises the same concerns as deep wells), light touch to landscape (a 750 m² excavation is the opposite of it), and the envelope, which shrinks demand until even a winter-weakened air-source pump becomes workable.

Approaches. Notable projects

Two forms. Vertical boreholes, 50–100 m deep, drilled by specialist rigs: compact footprint, higher cost, and drilling that raises aquifer questions. Sealed closed loops carry minimal actual risk. Horizontal loops at 1.5–2 m depth: basic excavator work, dramatically cheaper. The price is land: roughly 40–50 m² of open ground per kilowatt of extraction, and that ground must stay unpaved and free of deep-rooted trees. A third direction is emerging at a scale no single home reaches: shared ground loops serving whole neighbourhoods. In Framingham, Massachusetts, the utility Eversource became the first US gas company to build one. Inside it, 88 boreholes around 650 feet deep link 37 buildings that trade thermal energy on a single loop. The system has run since 2024, and an $8.6M federal award in December 2025 funds an extension to some 140 more customers. It is a gas utility reinventing itself as a geothermal one. That scale belongs to a whole neighbourhood, and it is where ground loops are heading.

And in the Ukrainian Carpathians this page keeps circling, the same geology has just gained an institution. Geothermal Ukraine is a non-profit R&D organization founded in Ivano-Frankivsk in April 2022 by petroleum engineers and geoscientists redirecting oil-and-gas expertise toward the heat under their feet. Together with Iceland's Verkís and ÍSOR, it runs feasibility studies for geothermal district heating and industrial use across the Lviv, Ivano-Frankivsk, and Transcarpathian regions. Iceland heats about nine in ten of its homes with the ground's own warmth. Ukraine has been surveying its subsurface heat since the 1950s, and the isotherm maps exist. What was missing was an organization reading them with intent. It now sits in a ten-partner Horizon Europe consortium on industrial geothermal heat.

How 001 engages with it

Our published heating article walks the decision from end to end. Geothermal won the argument on paper. COP 4–5 all winter against an air-source unit degrading to 1.5–2 in humid Carpathian frost. Ukrainian market pricing erased the cost gap: turnkey systems at $8–14k against $8–12k for air-source plus wood boiler infrastructure. The site had 600–800 m² of open meadow in exactly the right place. Trenching looked nearly free alongside planned septic excavation. Then four things reversed it. The excavator stopped being free: renting adds €1–4k. Wartime grid reality reframed backup priorities — when the grid is down for a week, a COP of 5 becomes an empty number and a wood boiler keeps the heat on. The forest reframed the boiler itself: Carpathian deadwood needs removing anyway, and burning it is stewardship, not compromise. The fourth was an objection that refused to be rational: digging up 750 m² of meadow would be the single most invasive act in the whole construction sequence, on a site where everything is meant to sit lightly on the landscape. We took the values objection seriously instead of arguing past it. Current direction: air-source with the hybrid split. Geothermal is honestly shelved, not refuted.

Maturity: researched. Fully evaluated for Unity Hub, priced, sited. We set it aside for documented reasons that mix engineering, war, and values. The page stays open: on a flatter site with different values-weightings, our own analysis gives geothermal the win.

Working on this? If you run a horizontal-loop system in the Carpathians or comparable terrain, your operating data would test our paper conclusions. Get in touch.

Further reading