Millions of people have counter top ice makers in their home that use propane as a refrigerant. If you have a gas line that brings gas to your stove, having a

Millions of people have counter top ice makers in their home that use propane as a refrigerant. If you have a gas line that brings gas to your stove, having a heat pump circulate that same gas as a refrigerant isn't much of a stretch. Especially if its replacing a gas boiler.