1#feinet2001 d' h( [6 A! _7 @5 V2 t( e1 T
@% k6 j) y @, ~0 u
option 1: Two seperated furnances and seperated control & D% C5 }: K3 n' C3 Y' H& ` (for big house > 3000 ft) 3 z6 I* Q) [# ^! Coption 2: One furnance with Zone Control device ! U4 Q% W, @: G% _0 g' y! h
(three zones or fours zone will be good) - total efficiency will be higher4 [8 j8 M+ m; t4 b2 q2 R' Y
7 J( V% J6 l4 l4 [& E
Total cost is not big difference.