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I close mine. Early in the season, like now, put your hand up near the register and you will feel the warm air from your rooms convecting into the attic. Or you may feel a cold draft from some of them. What is happening is that the ductwork in the attic is becoming cooled; then the warm air from the house is rising into the cool area, setting up a loop in which there is a constant loss of your heated air.

It may seem minimal, but over the course of an entire season it adds up. Don't forget the return vent. I replace the filter with a piece of cardboard (try a panel from the box the filters came in).

RICHArd

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Q: Do you close or keep open the ceiling registers of central AC system during the winter?
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