The house will be a single story 2500 sf home located in Oklahoma City, OK.
The builder recommends I choose between the following setups:
Carrier 58MXA (95.5% AFUE) and 38TXA (13 SEER), or
Carrier 58DLA (80% AFUE) and 38TKB (10 SEER).
The builder also recommends a 4-zone system for either setup with a SpaceGard air filter. He assures me either system would be sized based upon Manual J load analysis.
Does anyone have any recommendations about how I approach the task of determining which setup is preferrable for me? Is it simply a matter of determining if I can afford the more efficient system, or are there other factors I need to consider?