EVAPORATION causes heat loss locally and CONDENSATION causes heat gain locally. Both effects can be used to heat or cool air or surfaces.
An ordinary elm, of medium size, will get rid of 15,000 pounds of water on a clear dry hot day.
The USDA’s Yearbook of agriculture on trees (1949)
Thus, on a hot day, the evaporation by trees cools air.
While the night condensation of atmospheric water warms the surrounding air. Moisture will not condense unless it finds a surface to condense on. Leaves provide this surface, as well as contact cooling.
A small open water storages or trees upwind of a house have a pleasant moderating effect.
The trees are also capable of reducing humidity by direct absorption. This provides DEHUMIDIFYING effect in hot and humid tropical areas.
Trees are nature’s multi-functional elements. Just that we take them for granted because they don’t ask for monthly service charges.
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