Eli5 why does turning off room heating cause more condensation

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I live in England where radiators are commonplace to heat the house. And after I turned mine off inside my room I noticed excessive condensation on the windows. I thought the reason for condensation was a temperature differential. So why is making my room colder (closer to the outside temperature) causing more condensation on my windows?

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3 Answers

Anonymous 0 Comments

Water vapor and humidity. I’m sure you’ve heard the whole cold glass and hot day analogy? Do you realize that you also contribute to water vapor and humidity in the room? The water vapor that is turning into liquid form only has so many places to go. The window is an obvious place. Look at your radiator; there may be condensation there as well. Why there is more condensation when it’s colder in the room? The water vapor is hitting the point where it needs to turn into a liquid. If it’s colder in the room, the window is still the sweet spot.

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