ELI5, why do we usually have radiators under windows? Doesn’t the heat just go up then straight out the window?
In: Other
Windows are the major heat sinks in our dwellings. Air next to windows gets cold and settles to the floor (because it’s more dense than warmer air). This will quickly make the floor in your room uncomfortably cold. So a radiator under the window will quickly reheat that cold air and send it to the ceiling, reversing the flow of air in the room and preventing those cold drafts along the floor.
Edit: Also if the room or apartment doesn’t have a dedicated ventilation system, windows will serve as one. Cold outside air leaking in through the windows needs to be heated right away for the same reasons.
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