1850 sq ft lower floor with a 350 sq ft bonus room over garage
1) 3.0 ton downstairs and 1.5 ton to bonus room upstairs
2) 2.5 ton on one end of house (kitchen, great room with 12 ft ceiling, dining, kids bedrooms)
and 2.0 ton on the other end (master bedroom/bath, utility room, and bonus room)
Much of the time the bonus room will not be being used. My master bedroom also faces south.