3 ms·
Thanks for putting specific numbers to it. It's really surprisingly efficient, especially at warmer temps (0℃) which are more common in most of the US.
by ericd 13y ago
Thanks for putting specific numbers to it. It's really surprisingly efficient, especially at warmer temps (0℃) which are more common in most of the US.
- mistercow 13y agoThat number is also assuming that the pump pulls from the air rather than the ground. Ground based pumps are apparently more efficient (well, energy effective; efficient is not quite the right word in this case) because the ground warms up in the sun more than the air.