Jamison,
If a home rated ar 5 Star in 1996, it would be reasonable to expect it to rate the same today if the home has not changed and the software for the rating is the same. I am not sure if AkWarm was in use in 1996. You could get the transition date from Easy Rater to AkWarm from AHFC. Another issue would be the window efficiency, if the energy value of the windows could not be re-established or if any of the window seals have failed, the windows would have to be entered as a default value which may take the rating down to a 4 Star Plus. It would be helpful to have a copy of the initial 1996 rating to compare the input values.
Chuck
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