Been running my A/C at 78....tank has been getting up to 82.5 tops....but drops to 80.5 in the mornings. Everything looks fine. I've been to shops that there tanks get 82-83 on a constant basis and never have issues. Not that I like my tank getting this warm but I don't want to pay even more in my A/C bill than I already do. Ohh ya. I do own a chiller
... but it's been offline sitting in my garage for the last 2 years. The noise of my chiller AND my A/C running AT THE SAME TIME just stresses me out even more so........