60,000 BTU vs 80,000 BTU

Trying to decide between two furnaces.
Property located in Boylston, MA 01505
Two-story condo 1,250 Square feet built in 1974
Windows and insulation in attic have been upgraded
Original unit was 80,000 BTUs 80% efficient. 1st contractors recommended 80,000 BTU 80% efficient.The second contractor recommended a 60,000 BTU 80% efficient. Manuel J was around 40,000 BTU. But that seems awfully low for this climate. Any recommendations would help thank you.


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