1#feinet20016 z& `9 n. x8 y* {! M
( d% w5 n. J& W6 @
option 1: Two seperated furnances and seperated control7 w; D: B( x6 y- k1 w( q( @* V0 ?5 I
(for big house > 3000 ft) : R0 u+ `9 i7 c aoption 2: One furnance with Zone Control device . i% q/ a8 E) g, K (three zones or fours zone will be good) - total efficiency will be higher5 R8 c1 e5 o' ^) f7 t) t/ i
0 }+ R5 T! ?: K7 QTotal cost is not big difference.