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?
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Your entire house is not at a even 21, technically, only your thermostat (which measures the temperature).
So during summer, rooms away from the thermostat with windows could be warmer, and colder in the winter. In addition, things like your floors can vary in temperature. If you have a house built on concrete slab, the floors you stand on will be colder than the air, transferring the cold into your body through your feet.
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