! u5 w2 x! l8 F: Q9 S. @- \option 1: Two seperated furnances and seperated control 0 Q" G5 p: L; K9 v/ Y6 \) J ] (for big house > 3000 ft) # T9 |# E, ?) @& I- m! Boption 2: One furnance with Zone Control device + s" K2 _, n! R
(three zones or fours zone will be good) - total efficiency will be higher: x- r/ y9 [# p7 r1 ~* O! Q+ _
6 V& U) i0 Y0 I" @- RTotal cost is not big difference.