Heating and H/P the entire first floor and basement
The First Floor is the 1600sqft, the second floor is not in this number since it is heated and cooled by the mini splits.
2nd Floor-600sqft (Not to be included since it is served by the mini splits)
Thank you for the clarification. The guy that suggested the 100,000 and 4 ton must be smoking something. Absolutely no way. You will hate the 4 ton blower noise, not to mention it won't work.
Your 1st floor basically has no heat loss or gain. According to your calculations, a 60,000 input btu (96%) furnace and a 2 ton H/P is in order.