from the UK - groundsource vs air-source heat pumps makes a huge difference. Last i checked: - ground source was roughly parity with gas (with something like a

from the UK - groundsource vs air-source heat pumps makes a huge difference. Last i checked: - ground source was roughly parity with gas (with something like an 8x higher install cost) - air source heat pumps were more expensive to operate but similar on install costs However comparing on cost only misses the point, a heat pump is generally capable of cooling as well, which is becoming more of a necessity in the summer. P.S. You can do silly things with ground loops like use excess solar power to cool during the summer or daytime storing that heat in the ground, then removing some of it in the winter/nighttime.