I know it seems like a no brainer. Close the swivel vents and you prevent the hot air. But then it does heat up the baseboard covers and allow for slower cooling, more heat time. Just wanted to see what you think? Jack ":-Dx :vs_wave:
Copper fin baseboard is a convection heat. Closing the louvers slows/reduces the heat output, and just causes the circ to run longer using more electric. And the boiler to stay hotter longer, putting more heat out the chimney.
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