1#feinet2001/ j) I2 z$ m6 N1 C- h: V& \9 H
% e& u+ d! y: f0 ^
option 1: Two seperated furnances and seperated control : _4 Z8 U& T3 p (for big house > 3000 ft) : M1 g3 e8 z1 p1 q/ Voption 2: One furnance with Zone Control device ' V& j: B0 x5 T! X" S
(three zones or fours zone will be good) - total efficiency will be higher " f5 B; [( S" t L- F! d; t P7 O1 U' i _2 S
Total cost is not big difference.