Hey all, I was inspecting a house today and they have done an addition on the east side of the home which is very cold compared to the west side, When entering the crawl space and investigating the source here’s what I came up with. It kind of looks like a home made job with wires and duct tape.
I think they may have cut one line so they could add two additional lines to feed the two vents on the east side this is why it is so cold because the air has to travel further??. The picture doesn’t show well but there is a metal trunk box in the middle of this nest.
One last note it takes about 15 min for the room to get to a warmer temp.