Agree About Not Closing Vents

https://www.mediafire.com/file/vb9g5zytt5azzih/pdf-40299-37737.pdf/file

Agree About Not Closing Vents Agree with the point about not closing too many vents. I used to shut them in the guest rooms to cut energy use, and the system started whistling and running longer. Opened them back up and things calmed down