Agree About Not Closing Vents
https://rylanuzqc725.opalvector.com/posts/comfort-experts-furnace-repair-alongside-ac-repair-for-north-fort-worth-winters
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