Signman that is a big temp swing shouldnt change more than 2 degrees or so during the course of the day. do you have a sump? bmaybe put a fan to cool sump ,worked for me.Cause where I live ,I dont really need a chiller, just on warm days before we put the A.C. on in the house. So on those days I put the fan on.Also have 4 fans in canopy, 2 going out . 2 pulling air in.