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option 1: Two seperated furnances and seperated control u* h' f: u! i0 f (for big house > 3000 ft) 6 F; ?" Q; r2 t4 U3 a! voption 2: One furnance with Zone Control device _: w0 Y; [' K( Q: J1 c R+ z+ V0 \6 |% v (three zones or fours zone will be good) - total efficiency will be higher$ ?7 |9 i, e0 g& a) U3 `
7 {5 F! o3 R( Z& i) L5 g
Total cost is not big difference.