Cooling air with water
When water evaporates, it absorbs heat from surrounding air, so the air cools.
Evaporation works best when humidity is lower so the air can take up more water vapour.
Rates of evaporation are increased by air movement and the exposed surface area of water. Fountains and mist sprays are effective for cooling.
Other options include pools, ponds and water features immediately outside windows or in courtyards to cool air before it enters the house.
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