1#feinet2001, d& f- K6 z$ L8 B" [* X# g* Y7 Y
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option 1: Two seperated furnances and seperated control 1 _9 { ]+ N7 b1 M' ^ (for big house > 3000 ft) o6 O) m7 l1 A. soption 2: One furnance with Zone Control device 3 B# f7 U/ ~$ x% R- |8 a
(three zones or fours zone will be good) - total efficiency will be higher ( c& V3 ]( k( ?# K- W7 |8 c# ~* w3 ]" d5 Q- O; W4 s4 _3 P0 A
Total cost is not big difference.