Seems I have a problem myself. My 2500 gal system was running 79.9 today and my 300 gal system
was running 83.2 Had this problem a few months back and added a large fan that cut the temp
difference to 1 degree. Now the 3 plus degree temp is back. At this point not sure what to do yet but
the added amps of a chiller is not something I need at this point
David,
Probably cheaper to insulate the building and put a window AC unit in long term.