Eli5: I keep my AC at 21 celsius all year. How come I’m hot in a shirt in summer and cold with a sweather in winter?

Question

Eli5: I keep my AC at 21 celsius all year. How come I’m hot in a shirt in summer and cold with a sweather in winter?

In: 1

Answer 1

Humidity:

Summer is humid, winter is dry. 21C humid feels hotter than 21C dry, because your body has a harder time cooling itself.

(Also MAYBE direct sunlight, which is radiant heat which would heat you, but not the air around you, so your thermostats reads 21C, but in reality you’re heated much more than that due to sunlight, but I doubt this is applicable to you unless you’re in direct sunlight)