> Air conditioning is usually pretty efficient, with efficiencies better than 10 I think you are off by a factor of 3.412. The SEER rating may be 10, but that

> Air conditioning is usually pretty efficient, with efficiencies better than 10 I think you are off by a factor of 3.412. The SEER rating may be 10, but that means you push 10BTUs per Watt Hour, or 2.9 WH/WH. I am also assuming that burning NatGas produces electricity about 40% efficiency delivered, and burning it at home for heat is about 80% efficient.