1. Does the larger BTU unit blow more volume of air? More CFM?
Properly designed and installed air conditioners should move about 400 cfm air per ton capacity over the evaporator. They will function well at cfm as low as 350 and as high as 450. Lower cfm promotes latent heat removal and higher cfm promotes sensible heat removable. The dry bulb temperature differential of the air entering versus leaving the evaporator is dependent on the volume of the air and the latent heat of the air. The dry bulb temperature gives no indication of latent heat in the air.
So a larger btu unit should move more air. Of course this depends on the quality of design and construction of the AC unit as well as the quality of design and construction of the duct system.
