a simple explanation is that the higher the air temperature is the greater the amount of water it can hold, as the air passes over the coil it is cooled and can no longer hold the amount of water it contained.....as to your question about the 2 a/c... there are many factors that can affect proformance... a dirty air filter will impede air flow, dirty coils ( condensor and evaporator) in addition to reducing performance willl cause the unit to work longer trying to satisfy the thermostat, draw more electricity and cause premature failure... a low refrigerant charge and/or dirty filter or coil will cause it to ice up. most people dont understand how to size equipment. the size of the room could be a factor, are the 2 a/c also the same brand and model? a unit should be big enough to cycle on and off....bottom line is, a clean machine is a happy machine.... hope this helps.
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