I disagree. You still only need 400cfm per ton. Some manufacturers use a larger air handler on higher seer equipment because they want the increased coil size. You're supposed to lower the blower speed. If you use much more than 400cfm per ton you lose latent heat capacity. Likewise if you use...
I'm a licensed hvac contractor with 20+ years of experience. 70% of the quality is how well it's installed. Stay with the big 3 brands if you can. That would be Carrier, Trane, Lennox. Goodman isn't as bad as some people think but in my opinion their higher seer stuff isn't as reliable. Speaking...