1#feinet2001 7 A8 r! e7 @: V" K' [1 D3 i' t5 d- I+ \9 ~0 F( I+ Q+ y6 W) K
option 1: Two seperated furnances and seperated control $ c$ t3 B: v: ]; [ (for big house > 3000 ft)& _0 P" F. ?" {( G; i
option 2: One furnance with Zone Control device # B; O" P5 G9 X
(three zones or fours zone will be good) - total efficiency will be higher! r8 X2 l2 [) v' B# N
2 @6 Q+ Z2 f2 q! P1 \6 F7 [* TTotal cost is not big difference.