He may not have the measurements etc., but I have the experience.
Our house is over 100 years old, and likely much farther north than the OP. Our well water is so cold that most of the summer, you can barely hold your hands under it. We heat the basement in Winter, but do not cool it in Summer as we have high water table, and are "currently" pumping out between 5,000 and 6,000 gallons of water every 24 hours. That incoming water is quite cold, and yet the mid-80's outside temps still heat the basement air to a point where it stays fairly cool, but certainly not cold.
If we could run all that ground water through a water-to-air exchanger, we could gain benefit. But as I said, the upstairs only uses a 5,000BTU window A/C, and that's rarely ever on the high setting. When the water table is low enough that the basement dries out, the air temp in the basement gets rather warm. I've seen it hit 80F down there.
Our basement also has a cistern. It is solid poured concrete, thicker near the bottom and thinner near tops of the walls. That's the only part of the basement floor that DOESN'T get wet......ever! No air flow in the basement either. No problems with the cistern walls getting mold growth or other unwanted nasties. Not sure why....maybe the normally-cooler temps?
My point is, right now we're having outside temps in low to mid-80's, high humidity (I'd swear I saw fish swimming through the air! :shock: ), and thousands of gallons per day of cold ground water coming in. Basement temp is just comfortable. Not cool, just comfortable. If he fills his cistern with water that has no means of passing the heat gain into the earth, then that water will simply warm to a point that it will no longer provide any cooling effect. Then, that much water would 'hold' the heat during the night, when your house is trying to cool down naturally. Look into solar greenhouses that use 55-gal. plastic drums filled with water that absorb heat during the day, then give it off at night. They don't use the barrels in the Summer, as no need to heat the greenhouse at night. There simply wouldn't be enough heat exchange between the cistern water and the cistern's concrete floor -- no economical way to put the heat gained from the rest of the house into the earth. In effect, your heatsink wouldn't be the earth, but just the cistern.
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