1#feinet2001( I1 I$ O$ O' y+ z% T* G
q) x, _& R$ I5 e; T
option 1: Two seperated furnances and seperated control 8 J$ U* _# |# x5 [ (for big house > 3000 ft)( @, a n# l; m3 @
option 2: One furnance with Zone Control device & [+ x- j% g+ @ F
(three zones or fours zone will be good) - total efficiency will be higher ' n4 w1 F6 c0 k/ U v- e$ N1 n - L; y0 Y1 |3 L7 r. JTotal cost is not big difference.