I am located in Central NC and we have a 3200 square ft building that is one large open room. We have vaulted ceilings that are 24 ft at the peak. We have four 3 ton LG mini splits that are mounted about 10 ft from the floor and cool the space with no issues. This has been set up for almost 5 years and has been great. Today we just noticed water dripping from the ceiling. We have a scissor lift so I went to investigate and found that the peak of the ceiling and about 5 ft down from the peak had condensation and mold in several spots. The ceiling is a dark stained wood tongue and groove, so it was not easy to spot the mold right away. The room stays nice and cool and I am able to keep the temperature pretty much where I need it, even with 200 guests. It is much hotter above 12 ft and even hotter at the peak, but this has never changed was always this way. The question is can anyone explain why all of a sudden we would have this condensation and mold? Do I need some type of ventilation for the area above the mini splits?