Like would that even be possible in any way, could it happen and why or why not?
Would the environment also suffer because of the warm-blooded insect(s)?
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Some insects already have some degree of 'warm blood' for example, flies need hot wings to fly, and the vibration of their wings generates heat much like shivering generates heat for humans, and allows them to fly. Bees during winter will cluster together and vibrate to generate warmth.
Being full body warm blood is much more costly. Warm blooded creatures tend to need ten times more food than cold blooded ones. But, warm blooded creatures are pound for pound much tougher than cold blooded creatures, can operate in the cold much better such as at night when cold blooded creatures shut off.
Insects have a much higher volume to mass ratio, so them becoming warm blooded would be much more costly. They would lose a huge amount of energy from their huge surface area. It's much easier to stay warm as a larger creature.
As such, it would be likely in two situations.
Giant insects, whose mass was large enough to support being warm blooded.
Clusters of insects, who worked together like bees to stay warm in cold environments or disease heavy environments where high heat was needed.
If they were routinely being warm blooded one large consequence would be that they'd burn as many calories as mammals did and would need ten times more food.
They'd also be able to hunt at night much better, resist diseases much better, and would starve much faster.