So the AC guy is telling me i need to match the exact specs of my old fan motor - HP, Amps, RPMs, Volts. I was under the impression that if the volts, HP and RPMs matched then the amps could be slightly higher or lower. I can find much cheaper replacements than what he is offering but the amps dont match exact. What would be the problem with 1.6 amps instead of 1.8; or 2.0 amps instead of 1.8? I thought higher amps was the same as derating the motor and lower amps would cost slightly less to run. Thanks.