I have to decide on an air conditioning unit. Have had 3 estimates and they have all said a 2.5 would be needed for the size of my home, windows etc.

I have to make a decisionas to which of the 3 next units I will pick:

1) American Standard 4TTB3030 (4A7B3030) (I was told both model #'s are for same unit.

2) Rheem 13AJN030 or

3) Amana GSX13030

American Standard was quoted by same installer as only $100 more expensive.

Any help would be appreciated