I like to cool mine, it saves time and money with cleaning and feeding expenses.
With diamonds for example, They will feed in the wild for only 4 to maybe 5 months of the year, at the beginning of the spring when they are coming into feed mode they are at their most energetic and fast moving, sort of at the top of their game, and quite willing to bite if handled for too long or roughly. Any other time they are slow docile and a lot less inclined to bite. The natural winter cooling certainly seems to benefit the wild ones as like I said they come out of winter at the top of their game raring to go. it certainly doesn't do them any harm unless old frail or sick.
For what its worth I see it as a cycle, a rhythm of life that they have evolved with. Any change to this cycle, as far as I am concerned, would probably be stressful.