Honestly, I don't know if it's bad, but judging from the temperature differential in the house, I need to do something!
System is a brand new Carrier Infinity 16 4-ton Heat pump/ Air handler, Aprilaire 700A humidifier, and Infinity controller. I only have electric service to the house, no gas.
The installation went well and the technicians seemed well informed and competent. When I had the estimate done, the 'salesman' (retired installer) wasn't too concerned when he looked at the existing setup, and said that the new system (replacing a 23 year old air handler and a 13 year old compressor) would probably fix the existing upstairs/downstairs heat difference.
Currently, when the system attempts to reach a temperature of 70 on the first floor, the upstairs will go as high as ~78.
I've attached (i hope) a picture of the supply ducts as they come off the air handler. The supply that runs off the top of the box is for the 2nd floor. The one that goes out to the right is for the basement and 1st floor. I'm fairly certain that a shoddy job of refinishing the basement entailed adding more runs onto the first floor supply that were never intended to be there. Is it safe to assume that the horizontal run out of the box gets much less airflow than the vertical?
So, after my long tail of woe, do I:
A) hire someone to add a mechanical zone damper with an upstairs temp sensor to the 2nd floor supply
B) have the first floor supply moved to the top of the box and split into two to pass over the I-beam, through the joists, and rejoin the existing rectangular supply
Thanks in advance for this great source of information. It's tough when someone comes to the house and is supposed to be an authority on this stuff, and I as the homeowner don't know enough about it to make an informed decision!