@smellsofbikes @shuttersparks BINGO! You are spot on.
@cobalt @shuttersparks it's probably also quieter on the roof than under/near a window.
Sure is inconvenient to work on.
@smellsofbikes @shuttersparks never saw a company put up a canopy tent over work location before. No rain expected here.
@smellsofbikes @cobalt Yup. That must be the reason. I remember in the '60s when evaporative coolers were everywhere.
@shuttersparks @cobalt it helps keep the heat out/away from the house.
In my neighborhood every house has an evaporative cooler on the roof because they have the ductwork in the attic, separate from the central heating. I wonder if Arizona originally did the same and then replaced them piecemeal with AC and the placement became standardized.