What are you looking to do? Replace what you have? Is it 80% or 90%? Is it for your own home? Do you plan on living there forever? If you can give me some idea on what you are doing I can stear you in the right direction.
To be honest with you, half of the system breakdown's are due to poor installation and that's it. Most unit's are made on the same assembly line with different sticker's. I have put alot of Goodman unit's in and had no problem's, again I have put in alot of Trane or Lennox unit's and had problem's and then no problem's. So I would have no problem recommending the Goodman name at all. For the price of it as well you will save money right off the bat.
Your question had already been answered by me. But some how it has changed to a different catagory. Is there any thing else that you wanted to know about this or any other equipment you were looking at? Just let me know.
Tell me what part of the country you are in and maybe some kind of fiqure's you are looking at. I still do sell, install and service HVAC so I know what the prices should be. If the one guy is that much lower (how much is much) Then we can look at it together to determine.
Did you by chance get a 3rd quote? So in reality the Goodman Co. is charging you $6220.00 then you get a $1000 back? And that is 14 Seer not 13 Seer? It just sound's to me the electric company is just High. The Goodman dealer seem's right where he should be.