Trees are cool.
They are natural air conditioners.
The evaporation from a single tree can produce the cooling effect of ten room-sized air conditioners operating twenty hours a day.
In Palo Alto, CA, communities with trees averaged 6-8 degrees cooler temperatures than communities without trees.
Well-placed trees can reduce residential air conditioning costs by 20-50%.
Do the math.
Planting trees is a good investment.