Last month I had a complete new system installed with all new duct work. The new system was working awesome (even temp throught home) untill about 3 to 4 days ago. The issue is half the house can be 71 and the other is 69. The installer added a small return for the side that now is 1 to 2 dregrees colder. So I did some looking and what I found was that the new return is almost closed shut. Looks like flex duct was use at the return.
I know a quite a bit about airflow! I had a few hotrods. I know for a fact that to get air to make a 90 degree turn you have to have a gradual bend.
What should the total air flow for a 3 ton system be? Is there a min/max system pressure that can be messured?
Suggestions to what to ask the installer to check??