Others have mentioned humidity which can definitely make a difference.
Another big difference is from radiant heat. On a hot day, the heat not only warms up the air, but also the walls of your home as well, and those walls radiate heat back inside. Your body absorbs radiant heat much more readily, thus why you can feel warm by a campfire on a cold evening. Your standard thermostat can’t accurately account for radiant heat, so even though the air temperature may be the same, you’ll feel warmer on hot days as the walls warm you up.
Latest Answers