I would get at least 3 estimates, you will need the same ton rating as the original. I would look at higher SEER rating, but be aware as this rating goes up the cost really go up, so you my not save anything. I am assuming that you will be replacing the both outside and inside units, my understand is that there are some savings with the new variable speed air handlers. When you get the estimates make sure you are comparing apples to apples.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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