1#feinet2001; `1 h1 X$ S. m; D1 M
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option 1: Two seperated furnances and seperated control( I, {8 ?" N! f M% e% ]
(for big house > 3000 ft)% L8 @3 H; e- @" X" d; @$ ]
option 2: One furnance with Zone Control device / w2 x/ u# z0 x2 w6 r
(three zones or fours zone will be good) - total efficiency will be higher " V4 _+ P0 ~/ H! K) q+ s3 b ' \3 @* o [8 rTotal cost is not big difference.