Just curious, is there a reason you don’t want to go ahead and heat the tank? It seems to me that adding a heater(s) to the tank and having a few extra bucks a month on the electric bill will really open up your opportunities. I may have missed your reasoning, or you might just want it unheated “just because,” which is completely fine. I’m just throwing it out there.
Yup dont want to heat it just because.