Not true. It is less costly to rate the lowest efficiency system and applying that rating to all systems that are at least that efficient and better. Goodman has practiced this system before and is most likely doing the same now to reduce costs.
Originally posted by thighway
If having to do a test to confirm a 92 or 93% model, it would cost no more money to confirm a 94 or 95% rating.
Also, AC SEER ratings are generalized based on several different coils that can be used. For example, the Goodman 12 SEER may be a 12 SEER with the Goodman coil w/ TXV on it, but only 11 or 11.5 with a regular coil. Goodman has a series of charts, just like the Amana and Carrier ones I possess, that will distinguish between various coils, and blowers as a matter of fact (a variable speed blower will also raise SEER rating).