Agree About Not Closing Vents
https://lorenzoszlg218.readspirex.com/posts/heat-pump-and-ac-repair-in-north-fort-worth-by-comfort-experts
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