When in reality, blue light is the higher energy.
I see numerous examples of red being associated with hot, but there are fewer examples of blue being cold. I think it may be more along the lines of "not hot" is cold and "not red" is blue.Perhaps because fire, bonfires are red-yellow. Embers are red. Hot metal is red. Volcanoes lava is red...
On the other hand. Ice is sometimes bluish. Cloudy days are of higher color temperature, this is more bluish. The sea is blue.
The heat is infrared and we are not sensitive to light (except for the eyes). Too much visible light on our skin are turned into infrared and this is why we notice its energy.