For two reasons... she is talking about shutting it down for the season, not a few hours.
And secondly... when cold water is pumped into a tank and allowed to set... it will draw ambient heat from the room (the one you are trying to cool) and warm up to the point of reaching ambient temperature.
Since the heating elements would be shut down for months... and the tank would gain heat while cooling the space... she gets water at maybe 70F without any cost to her... while also losing heat in the space.
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