Technology Connections seems pretty happy with his. I think he lives in Chicago, admittedly not the coldest place, but it does snow every winter in that region.

Technology Connections seems pretty happy with his. I think he lives in Chicago, admittedly not the coldest place, but it does snow every winter in that region. He said 2.9 coefficient of efficiency average over a heating season for him - https://youtu.be/7J52mDjZzto?t=1522 https://youtu.be/7J52mDjZzto?t=1522