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Do you have a Heat Pump in a cold climate?
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Yeah, if I recall what I had read about it, the part that was new was that oil well drilling technology was being applied that could really expand the types of ground it could be used in. I think the equipment has also gotten more compact, so it's easier to drill in smaller spaces to be able to install it in more existing houses. I don't think it's really been any technology breakthroughs, but more like improvements in the engineering of it