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> Also you may risk giving more people diseases and reduce cognitive abilities when things get cold.

Could you explain this part? This is exactly opposite of what I've seen my entire life.

Yes, many people argue that they function better in the cold. That very well may be true. People's metabolism and feelings are very different.

That's taking about what's generally accepted. The body of literature in this field defines a "comfort zone" that spans around and above 20°C. it's been studied that with better comfort there is better attention. Also being cold appears to weaken the immune system.

Mine and everyone I know's immune system is strengthened, not weakened, by cold.

It "appears" to weaken by giving it a run to its knees, but actually making it stronger while doing that.

If you expose yourself to more cold, you start never getting ill.

Older people have much weaker immune systems that aren’t strengthened when it gets cold. HK lacks central heating, and a bunch of older people died when they had a cold snap that took them down to 5C. If you think your immune system is helped by being cold all the time, southern China during the winter is the place for you! It’s amazing how constantly being continuously exposed to non freezing but still cold room temperatures can really mess up your immune system.

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