<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31377306</termId><termName>geothermal heat pumps</termName><termType>PT</termType><termNote><![CDATA[ A geothermal heat pump (also known as a ground-source heat pump) transfers energy from the ground as a component of heating, cooling, and water-heating systems. A collector hose filled with a carrier fluid (water or a combination of water and antifreeze) is installed in a borehole which is drilled into a geothermal aquifer. In colder months, this circulating carrier fluid absorbs heat from the surrounding bedrock, which is then extracted by the heat pump for use in space-heating via piping connected to the heat exchanger. During the warmer months the process is reversed: heat from the air is transferred to the heat exchanger and into the fluid. As it moves through the pipes, the heat is dispersed to the rocks, soil, and groundwater. ]]></termNote><termCreatedDate>2026-03-30 20:41:46</termCreatedDate><relation><relationType>UF</relationType><termId>31377307</termId><termName>GHPs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377308</termId><termName>GSHPs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377309</termId><termName>geothermal heat pump</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377310</termId><termName>ground source heat pumps</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377311</termId><termName>ground-source heat pumps</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377312</termId><termName>pumps, geothermal heat</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31347230</termId><termName>heat pumps</termName><termType>PT</termType></relation></term>  </Zthes>