Oman has a warm
desert climate and along the coast you will experience great humidity in summer. Temperatures during summer may exceed 50 degrees Celsius, so keeping those miners running.... will be costing them a fortune.
Yes, night temperatures might be a lot cooler, but miners have to run 24/7 to be profitable. I see a lot of these Oil rich nations are diversifying into other projects that are not linked to oil.... possibly a backup option when the oil runs out.
I think that they might be able to offset the cooling system during the day since the temperature drop during the night would be a factor to their cooling system, I think it's stupid of them to not utilize or integrate that into their system. And if we're talking about electricity, I think they have a pretty low expense on that especially as an oil rich country. And also, oil won't run out anytime soon, that's a bullshit created by the scientists that Rockefeller hired to create the illusion that oil is a precious resources and that it's limited so he can have a higher asking price for it.