1#feinet2001 ' S4 q8 F6 v o9 n ; F, e" ]2 M# aoption 1: Two seperated furnances and seperated control7 m- S9 q' E+ s" W6 W
(for big house > 3000 ft)# Q( R1 W4 n1 @( }4 U
option 2: One furnance with Zone Control device 1 I3 ?9 z7 r4 c! J/ h3 f* k (three zones or fours zone will be good) - total efficiency will be higher' r9 G2 |7 F+ O% ?
% Y5 p9 B; C* w! t
Total cost is not big difference.