I need to replace my 4 ton AC/Heating system and have read a lot of posts and it seems that picking a good contractor is almost as important and the brand of equipment. I think I will stay away from Goodman products and will go with a R410a unit. Now I just need to get some info on how to pick a good contractor.

I live in the midwest (St. Louis MO area) and there are pages and pages to pick from in the phone book. How can I narrow my search? Can anyone list some of the questions I need to ask? Also, how can I verify this, the BBB?

Last thing, can anyone recommend what Seer rating I should go for? I plan to live in this house at least 5 more years.

Thanks in advance.