so I have a newer (2000) 2 floor home with forced air. The problem that I’m having is that the upstairs never gets warm enough. I have even closed most of the ducts to the downstairs but it still remains 6 degrees colder upstairs. the whole systems appears to function well, all vents blow heat, all returns suck air in.
in my research, it looks like the cause of my problem is probably related to the returns. I have high returns in every room. I’ve also blocked off the heat vents in the two unused bedrooms, but it appears this might make things worse.
In theory I’m thinking that blocking some of the downstairs returns might cause the upstairs to increase in warmth.
thoughts? do I have this correct?