Hello, I am confused about air conditioner Btu specs. When I try to match the power input in watts, to power out in Btu/hr, the numbers don't come out even close. Example: This 6000 Btu window unit has the following specs: Volts 115 Amps 5.4 So the power input in watts is: 115 x 5.4 = 621w, and 1w = 3.42 Btu/hr The maximum cooling should be 621w x 3.42 = 2124 Btu/hr, not 6000. I have tried this with a couple of different ac specs, and always come up short: (0.3~0.4) x stated Btu spec. What am I missing/doing wrong? Thanks!