Humans lived in the last ice age. Before the dawn of modern technology, there was no heating, no cars, and they lived in huts with clothing made from animal hide
They survive because their migrated south away from the advancing ice caps
They didn't live in the polar regions
Given that the whole thing you said is disingenuous in the first place, I don't what you point is. The temperatures might cool a bit in 2027, there have been cooling events before, look them up. Humanity survived.