I asked this question yesterday and was told to check pressure, I am trying to get the person that is certified who help me install the unit. He did pull a good vacuum on the unit and held it there for awhile when he installed it, but never came back to check pressure after a few days of running. Will it help if I put more air returns in my house. I was thinking of installing another vent in the ceiling and use a flex hose to tap in the large air return duct in the attic.

Here is the link to your original post. Please continue it there.

https://www.askmehelpdesk.com/heating-air-conditioning/two-year-old-4-ton-unit-will-not-cool-good-did-last-year-218407.html