There is also a lot of difference between common air conditioners. Some 15,000 BTU/hr units can pull 2,000 watts or more depending on operating conditions. And some energy efficient 13,500 BTU/hr units supposedly pull just over 10 Amps at rated capacity, or around 1,200 watts.
Air conditioners' starting-current requirements also vary a bunch which affects needed generator size.
For owners who are going to power air conditioners from generators on a regular basis, it may make sense to pay a premium for high efficiency ACs up front to save it later on smaller generator and fuel costs.
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