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You probably didn't do the calculation correctly. The North American standard for split-phase power is 120/240V, not 110/220V. If your utility is selling you power at 110/220 they are still in the stone age. 6.1A @ 120V is 732VA (apparent power) and Power Factor needs to be applied to arrive at watts. My guess is that your A/C unit is probably about 660 watts (Power Factor 0.9).
Over-sizing an A/C unit is not good. There is a huge efficiency "hit" when you cycle an A/C compressor because the condenser cools off and the evaporator warms up during the compressor off cycle. So energy is wasted creating the temperature differential during the initial compressor on cycle, which in turn removes the humidity from the air passing thru the machine. An A/C unit that runs continuous will be much more efficient than one that cycles.
This is how the high SEER ratings have been achieved on more advanced A/C units. They use variable frequency drive on the compressor and fans to always keep the condenser hot and evaporator cool - but vary the machine's dehumidification and cooling capacity by changing compressor and fan speed instead of cycling them off and on.
Over-sizing an A/C unit is not good. There is a huge efficiency "hit" when you cycle an A/C compressor because the condenser cools off and the evaporator warms up during the compressor off cycle. So energy is wasted creating the temperature differential during the initial compressor on cycle, which in turn removes the humidity from the air passing thru the machine. An A/C unit that runs continuous will be much more efficient than one that cycles.
This is how the high SEER ratings have been achieved on more advanced A/C units. They use variable frequency drive on the compressor and fans to always keep the condenser hot and evaporator cool - but vary the machine's dehumidification and cooling capacity by changing compressor and fan speed instead of cycling them off and on.
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