1#feinet2001 7 j. _, T0 }( a: y* S4 Y I0 Z" d3 d3 v$ v6 G" G
option 1: Two seperated furnances and seperated control6 ^, y, W$ [8 l; U9 U
(for big house > 3000 ft) 7 u* z" ?7 I8 B' C( uoption 2: One furnance with Zone Control device # j: o/ W4 |. u3 f6 V3 ?
(three zones or fours zone will be good) - total efficiency will be higher% d6 \5 `! a( \+ R7 T/ d
. f2 R$ W$ m* f, V" }Total cost is not big difference.