Assertion: heat pump's system | /r/HasProperty | primary refrigerant loop
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text: By contrast, water-based geothermal systems rely on two loops on the ground side: a primary refrigerant loop, contained in the appliance cabinet where it exchanges heat with a secondary ground loop that is buried underground and is made of high-density polyethylene containing a mixture of water and anti-freeze (propylene glycol, denatured alcohol or methanol).