I think Im gonna beat that AC tech when he comes in next - and make him follow what I want. Why fight nature and end up with high bills.

old buildings in India utilise the hot air stack phenomenon to keep cool inside, they have little slits with backwards facing covers on the super high ceilings to vent out the hot air (no A/C in them buildings) - The walls are also hollow with slits up top and midway too, this causes the inner walls to stay cooler as a column of hot air is always exhausting from the top vents in the summer.

Infact if you look at the Taj Mahal walls, it also has very similar technique but also has some water spray system to cool the marble.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)