@tg88 when temp outside are 30 ° C what temp inside the container ? is it closed also in summer? what temperature for your GPUs ? Thanks for the drawing and pics

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Always 4 ° C more.
Outside Temperature 10 °C | inside 14 °C
Outside Temperature 30 °C | inside 34 °C
I keep it closed even in the summer.
I mine Ethereum and use AMD GPUS RX 4xx and RX 5xx and they work at 72 ° C.
inside temp 15 °C fan speed + - 20% | 40%
inside temp 30 °C fan speed + - 50% | 70%
inside temp 34 °C fan speed + - 70% | 100%