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[–] 18 points 6 months ago (4 children)

Shutting doors when the A/C or heater is on. Apparently closing doors behind you is rocket science out here in California.

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  • [–] 1 point 6 months ago (2 children)

    I did some research on this the other day because I was curious. Apparently it's better to leave the doors open if you have a central-air heating system, but closed otherwise (e.g. baseboard heating).

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