I have a waterfurnace 5, 4 ton, closed loop (3100 sqft house). Having trouble getting humidity below 64. Temp/humidity outside is around 73/99%. I've had the air set between 70-72 trying to get the humidity down, but I can't crack 64%. I turned the fan to auto, which helped some, but not enough. even with outside temps hovering 80 (temp set at 70-72 indoors still), this thing isn't removing enough moisture. What does it take without freezing to death?? How much humidity should be pulled with each degree temp is lowered? EX: if I lowered temp 2 degrees, should I expect humidity to decrease by 2%? I have a tech coming Fri, I just want some knowledge when he shows up. What should he be looking at to fix this?