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Intrigued,
It's the same thing like someone saying your going to run that big car on that little 20-30 HP electric motor. People try to compare engine HP knowledge to Electric motors and they don't understand how John Wayland's White Zombie with two little siamese 8" motors blows away the Corvette in the other lane.
Seriously though, 2 HP is plenty. This motor is designed to do 2 HP continuously. A typicall 6000 BTU window air conditioned has about a 1-1.5 HP compressor. This motor will be spinning the compressor at 1,330 RPM, which shouldn't be too much load. If it does bog down too much I'll drop it to a 4:1 ratio.
Compressors normally follow the rule that if you double the speed you quadruple the HP. So maybe your instructor was right. If the compressor was running with the engine revving to high RPMs, maybe it could pull as much as 20 HP.
One side note. Some people have tried treadmill motors to run A/C compressors. They are about half the size of this motor, and they don't quite have enough torque. However, they will work fine to run power steering pumps.
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