system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do you feel hot or cold even when the temperature is the same?

Why is it that sometimes my house is 66 degrees Fahrenheit  I feel warm and other times when my house is the exact same temperature I feel cold and have to put on a sweater? 

I could understand if in one scenario I had just exercised or had gotten out of the shower, but in both scenarios I'm just doing stuff around the house. 

Why does the same temperature feel different?
gpt
Room temperature is measured as the air temperature. Air does not absorb radiated heat very well but you do!

One form of radiated heat is from the sun and lights. Lying in the sunlight makes you feel much warmer. While most places have moved away from incandescent lights, they did radiate a lot of infrared light that makes us feel hot.

Radiated heat can also come from hot surfaces. If your attic heats up, your ceiling can radiate infrared heat. That's why in the summer, the same temperature may feel warmer inside than in the other seasons.