However, the heating and cooling system is designed around exchanging heat with a certain volume of air moving through it. As Ed Beal points out, some systems are designed around one part of the house getting more flow than another, like a 60/40 split, and that mix being seasonally adjusted. You can also manipulate what is fully open and what is partially open to do more work in selected areas. But don't completely close it because you want some amount of air circulation so it doesn't get musty. If you have an area that you never use, you can close it off to save on the utility bills. And you can set it anywhere in between to fine tune the flow. If it is perpendicular to the duct, it's fully closed. If the handle is parallel with the duct, it is fully open. Those levers control a flap inside the duct.
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