I will tell you the experience of Russian miners who have been mining on air-cooled ASICs for a long time, and then bought several containers from Bitmain.
As a result, when they encountered shortcomings and problems with spare parts, which are also very expensive, they made their own analogue, spare parts for which they bought in ordinary construction and plumbing stores. And the controllers were also found in their country, and in the end it turned out much cheaper, better quality and most breakdowns can be fixed with the help of a good plumber or electrician