1#feinet2001) d+ C4 m% P9 r [+ [
$ z" _, R9 j( {; U& S& F% y2 p, s; f
option 1: Two seperated furnances and seperated control 6 z7 w( O- z" M6 H (for big house > 3000 ft)9 S( }+ w4 }3 \$ ]
option 2: One furnance with Zone Control device : E% R) o8 O5 N. Y+ d; c (three zones or fours zone will be good) - total efficiency will be higher / p9 N; t6 F) ` q* {" z4 U* }! t3 q, ] 1 j; O3 H$ i- c0 s$ NTotal cost is not big difference.