It's been very common in Europe for years. People even have individual heat pump at home. US is so much behind on new technologies
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‘home geothermal’ isn’t really a thing unless you’re already living on a hotspring, which is quite unusual. (delta-v is not sufficient)
At the point someone is drilling km+ boreholes and installing MW+ turbines, it’s safe to call it commercial.
More than 900 shallow wells have been drilled at Rotorua for space and water heating for private homes, hospitals, schools, motels, hotels, and other commercial and industrial uses. At peak use, around 430 wells were operating. Currently fewer than 300 production and injection wells are operating, for approximately 140 consents takes. About 90 of the wells are less than 200m deep and typically recover geothermal fluid at temperatures of 120 to 200°C.