reminds me of a big comercial building I worked on. It had 2 big package units on a flat roof.
Someone got the bright idea of building a shed type roof over the flat roof. The upper end tied in to a taller attached building.
They built dog house style covers over the HVAC units, with lots of ventilation.
The fist hot day, I was called out to service the A.C. I made a few trips in the spring after that. After deciding not to continue throwing effort after foolishness, we told them either the roof or the HVAC had to go.
It is impossible to maintain a reasonable head pressure in an attic

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Consistency is a direct path to perfection.