Many know that I am finishing building my addition over the garage. Additional 650 square feet - extended both the master bedroom and the kids room. What the HVAC guy did was take the supply ducts off the MBR and made sort of like a main trunk line into the addition. Then, he created branches off that main extended trunk line and fed the new parts of both rooms. I felt the pressure coming out of the old supplies vents today - felt normal, fairly strong flow of air coming out of them. Then, I felt the air coming out of the new supply vents - much lower pressure. Is that normal or should they be the same pressure as the old ones?
I'm cooling the space now but its nightime and I'll see if the entire room is cool in the morning.