1#feinet2001 & t9 m( n" \& X: _3 Y4 r: q! X 8 U) n; G/ {+ X# G- ^; doption 1: Two seperated furnances and seperated control' G9 Y" e3 @% U: J6 l5 h0 e
(for big house > 3000 ft) 8 Y0 |: S7 E5 F" A* d j! L5 Y! O: x/ U8 D$ Joption 2: One furnance with Zone Control device 2 D1 G0 [; u( Q. e2 A
(three zones or fours zone will be good) - total efficiency will be higher & d3 v; v- i$ H) W' _( I# E2 D $ u. Z9 O. g, N, E& ZTotal cost is not big difference.