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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.

https://www.limetechnology.co.uk/upload/documents/1232015231_lt7465_adnam

s_brewery_case_study.pdf

NB. Multi foil insulation is expensive but very good, especially with the reflective surface.

https://buildingmaterials.co.uk/Foil-Insulation.html

Regards Toby