At least here it really is the humidity and not so much the heat, that is why we bought a window A/C unit, to dehumidify the house so it feels cooler, hauling milk jugs up from the basement will warm you up and working harder to go up and down the stairs will release humidity and heat in to the house, I'd sooner opt for sleeping in the basement.
I do like the thermal mass idea, but placing them in the shade in the house makes it sound like you have window shades open in the summer, limit the amount of direct light coming in the house and it will stay much cooler!
Personally I don't think you have the surface area nor the heat differential for the milk jugs to make a huge difference.
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