1#feinet20010 J' `- g' d2 c# a6 e( D- T' `
+ p: f: h3 p/ c% l% ^' R
option 1: Two seperated furnances and seperated control & w) Z- Y1 C7 ?' ~8 o6 N2 G+ N( J (for big house > 3000 ft); S) d4 I) G4 S' J' k5 g/ J0 q
option 2: One furnance with Zone Control device : _! _& \/ y* `
(three zones or fours zone will be good) - total efficiency will be higher 3 T) q1 }8 C: U" N . H2 B0 j$ e6 c' \$ | aTotal cost is not big difference.