1#feinet2001 0 @5 h6 m; N% e ) i* t* M$ G2 Y) F# `option 1: Two seperated furnances and seperated control " _: O/ ^. F5 Q3 W (for big house > 3000 ft)1 Q: w3 c) `: x# G9 @. _/ j
option 2: One furnance with Zone Control device ; |- ~! _# w' j3 v7 Q (three zones or fours zone will be good) - total efficiency will be higher% w( D0 J) j. g2 T" z) H' t+ z
6 b* a# t+ ?$ | m ITotal cost is not big difference.