Agree About Not Closing Vents
https://garrettrspz468.hexaforgey.com/posts/heat-safety-steps-while-waiting-on-ac-repair-from-comfort-experts-in-a-north-fort-worth-heat-wave
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