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Shade netting is simple and light weight solution. Brise soleil....overhanging shades?
A second roof with air space between is usual. Mass construction of walls to control heat gain/loss....earth blocks? Stack vent with draw in via pipes buried in earth, or running through water and vents in roof. Ditto +ve & -ve air flow across the building.
That is a hell of a lot of drugs to keep cool in that space................is it necessary? Can it be stacked into a smaller space within the warehouse and away from dispensary?? Obvious, but sometimes the obvious works!
I am reminded of Adnams Brewery warehouse, where it is so well temperature controlled with thick walls and roof, that the back up AC has never been used.
NB. Multi foil insulation is expensive but very good, especially with the reflective surface.