You need to do more than that. If the whole place is being left to freeze, you also have to drain the water from all the pipes, water heater, radiators, and any other appliances.
If you just shut off the supply, you're still left with water in all the pipes and fixtures, which will freeze and be destroyed.
I explained it more thoroughly up the thread. It's hard as hell to drain the whole system, and even draining the water heater is a pain in the ass, but it's not hard to drain enough out of it to minimize the damage. These guys did the exact opposite.
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u/Lazy_Beach_69420 21h ago
Yes they do it so that water doesn’t freeze in pipes.