1#feinet2001 % R" ^. I; U6 T& J2 b0 B- i' Z / Z' ]( y0 D+ M3 W# d5 poption 1: Two seperated furnances and seperated control " a- m# F6 T" f9 L8 h, K (for big house > 3000 ft) 1 q: h I0 R, H1 n; ?% O1 goption 2: One furnance with Zone Control device 9 g6 ?+ a' t3 C$ h$ P (three zones or fours zone will be good) - total efficiency will be higher/ x( F; a$ i0 O- L/ D
- A0 l# {! T. X* j+ |9 A+ L
Total cost is not big difference.