saturn tech
You still didn't answer the question that the thread originated with, so I am not sure of the purpose of your post.
I don't know what our chiller set point was yesterday (ACJr using the seasonal temp settings) but I did notice that the tank spiked at 78 late in the afternoon (With the setting sun baking that side of the house). It is supposed to be up to 98 again today, according to weather.com. I still need to put up a new, more permanent awning over our cooler.. I can tell that it looses efficiency in the afternoon, once the sun starts hitting it full on.