1#feinet2001 ) a4 s7 U' b7 F2 G0 W0 q, k0 ?- N7 D ^# X1 l5 d
option 1: Two seperated furnances and seperated control B. a$ f; V& C$ |5 f- {/ }
(for big house > 3000 ft)& `/ F$ l) ?7 h2 j
option 2: One furnance with Zone Control device 6 D D: n9 K6 `0 y0 ^- {: s
(three zones or fours zone will be good) - total efficiency will be higher ) m% K+ l7 i( A9 J1 Z' t 1 ]$ m" h6 Y3 c$ TTotal cost is not big difference.