Okay guys I'm a pro, But I do commercial refrigeration. So I don't know a whole lot about duct work and such. Here's my issue. One side of the house is comfortable, and the other side always is the opposite. I don't have duct work collapsed. I have a 4ton lennox. How can I test to see if I have too much air pressure on one side instead of the other. What should I see coming out of the returns CFM wise. Thanks guys.