If you have any doubt, go with an air source outdoor unit. They are boasting heavenly seer and heat gathering performance numbers, and the good ones can beat a pump and dump system if you have deep well water. The further away from the equator you are, the better a deep borehole system will satisfy you in the winter. But the Earth is still the limit here. How much worse will a one foot diameter popsicle gather heat with a one inch core than a half a inch? The world may never know...
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