1#feinet2001 ) \+ O) I$ |* ^8 b 8 K2 A# e7 |6 soption 1: Two seperated furnances and seperated control; Y2 |1 t; c8 T$ A+ b/ j- l4 O/ ~
(for big house > 3000 ft)- ~4 ?* \! k. D2 L0 R( h
option 2: One furnance with Zone Control device S* b# N: p1 v& L* C (three zones or fours zone will be good) - total efficiency will be higher 6 S! d2 S( S( O# N9 V* S. ?$ e
Total cost is not big difference.