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option 1: Two seperated furnances and seperated control 3 A( c$ C% U) l; g1 u" d# B (for big house > 3000 ft). {& e0 c$ |7 K1 E1 e7 S
option 2: One furnance with Zone Control device m! N8 I0 V( T+ I5 Y3 g* [6 z (three zones or fours zone will be good) - total efficiency will be higher / o8 t% U- u3 U2 ]- B$ }2 M; B & i, j% ?+ `: C# y u# c; HTotal cost is not big difference.