Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
added air vents, replaced traps, but still cold in Pittsburgh PA
This is a larger 2-pipe vacuum system.
I have added 2 Big Mouths (now have 2 Big Mouths, 2 Gorton #2, and replaced all the cross over traps that I could find. I also replaced 9 traps on the ground floor.
No improvement yet. Temps are 73 on one side of the building, and 60 on the other side.
Here is a heat picture of one of the problem rads (below).
Looking for more ideas. Any recommendations for someone near Pittsburgh?