1#feinet2001 ! U. w% M3 T1 J : H# [4 s9 e; E, q3 Y5 Joption 1: Two seperated furnances and seperated control4 m7 Y0 X/ {4 R: g$ B3 k
(for big house > 3000 ft) $ I* ^8 i. m; P, p6 }8 S0 l6 [) O# Woption 2: One furnance with Zone Control device ) R! a) M1 m$ i% P (three zones or fours zone will be good) - total efficiency will be higher 4 D8 @& {3 N) |8 [% a0 d / q, Z) P5 V( F: S0 dTotal cost is not big difference.