1#feinet2001 , A" m/ Z$ I9 l0 a/ i2 i+ N9 p - S$ z! n7 X6 B1 u! u) |option 1: Two seperated furnances and seperated control, i- ]# @! {7 ~: |2 y% A
(for big house > 3000 ft)4 H1 u3 Z) {+ e. K
option 2: One furnance with Zone Control device 0 G* S: l! L, f# n& Q# C (three zones or fours zone will be good) - total efficiency will be higher % s8 g' S! q. P- v- P& b$ Y& Z8 I
Total cost is not big difference.