1#feinet2001( Q6 B9 g( M* E' m: k4 `. [
7 H: J7 z/ n+ J, q) Z
option 1: Two seperated furnances and seperated control1 s# q6 h9 w5 w) Z- f, |
(for big house > 3000 ft)" H& t# b0 d' D6 v. b5 s
option 2: One furnance with Zone Control device o6 [+ t7 |' j) F0 O' F: c (three zones or fours zone will be good) - total efficiency will be higher) U9 @) B" |1 m" Z2 k, u
" k" _" q$ `6 u' B
Total cost is not big difference.