Water 1c change is 4184 J/kg (1 kcal)

Water to steam 2260 kJ/kg.

So 25c cooler is 25 * 4.184 kJ extra, which is:

25 * 4184 / (2260k + 75 * 4184) = 104600 / 2573800 => 4% more energy than 25c to steam.

And then you need a refrigerator to cool tons of water, instead of just carrying more water.