9 e2 X$ c7 L% ~7 R, Xoption 1: Two seperated furnances and seperated control ! e" N, H# f9 @; |2 \ d% G (for big house > 3000 ft) " C6 a; d5 r% R' Y' zoption 2: One furnance with Zone Control device * E- q. Y& h/ t; c (three zones or fours zone will be good) - total efficiency will be higher 7 n. {% K" O/ z/ M3 G, n: V: s7 p* Z4 K/ S
Total cost is not big difference.