1#feinet2001; g: ]5 c3 @2 A3 Z I
8 ~/ ^' U* u& S$ ^4 \/ U
option 1: Two seperated furnances and seperated control) R, \+ Q. C( v
(for big house > 3000 ft)8 _& X$ X. T( V1 R: E, _( o
option 2: One furnance with Zone Control device 6 N+ ], ^* M) C" V (three zones or fours zone will be good) - total efficiency will be higher* B' j" {& t7 X0 s7 z
4 Y, r% L' z. t; e% O3 kTotal cost is not big difference.