1#feinet2001 5 y0 e3 u1 A+ e- L' Y) Q7 O. e: v3 r" [, f3 z( r% b
option 1: Two seperated furnances and seperated control0 }% S3 P9 A2 D
(for big house > 3000 ft) 0 y) q9 E8 d2 E }! ^ u. koption 2: One furnance with Zone Control device 5 l. A* S: x. J! G (three zones or fours zone will be good) - total efficiency will be higher " u( B7 f' g4 x+ h/ ? 0 l& K7 S! N. c; N$ [. Y# hTotal cost is not big difference.