About
A-One Geothermal, Inc. has delivered ground-source heat pump loop installations to homeowners, builders, schools, and commercial properties across Iowa since 1987. The Earlham-based crew specializes in vertical boring (175 ft per ton of capacity) and horizontal directional drilling for closed-loop systems, and partners with Ohman Solutions to offer descaling and chemical maintenance of heat exchange equipment—extending system life for existing geothermal owners. Verified active operator per a-oneresults.com + BBB accredited listing (Bundle 3 audit 2026-05-26)
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A-One Geothermal — Earlham, Iowa
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