I installed a Freus, with a built in cooling tower, on a workshop. The sump water is in the low seventies. The pressures are 175/70. It never condenses water out of the air. I want to change from R-22 to 404a or 410 & am willing to change the oil to POE. My theory is I'd get an evaporator cold enough to dehumidify the air & reduce the enthalpy. What is wrong with this idea?