Vent 2nd floor bath fan in attic to roof jack. Bath fan Panasonic 110 cfm.
Replace boiler with new Weil McLain CGa-4 PIDN
Replace boiler with new
Replace furnace with new Daikin DR80SN060 60,000 BTU.
Repipe radiant heat risers to 2nd floor. Vent kitchen hood 300 cfm or less.