1#feinet2001 ~' F1 M" ^8 V: O+ w: A [6 y5 S; C8 Q9 E
option 1: Two seperated furnances and seperated control 7 t; \2 }1 I i* o9 J (for big house > 3000 ft) " c, L( }0 b* ^* r& u3 ioption 2: One furnance with Zone Control device 4 D1 T4 P' v) J' T9 \+ R
(three zones or fours zone will be good) - total efficiency will be higher - p$ q/ f4 Q& ?6 Q4 Q2 t [ . m6 z2 E5 b% [! g4 L) _Total cost is not big difference.