The temperature our bodies feel it’s a very complex matter that a 21C on a thermometer in a wall barely reflects. There’s heat index (windchill) that is temperature with humidity which measures estimated perceived temperature. Then there are air currents, that draw heat from your skin so the same ambient feels colder. There’s radiation from objects: you could be in a 21C room yet being hot because a wall of bricks exposed to sun is emitting radiation to you. There are also studies that bodies have season cycles so what 21 feels in summer is not the same as 21 in winter.
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