I just found out that my furnace is going south. It seems the heat exchange has a crack in it. Both units were replaced in '86 so they suggest replacing both units now. After the repair guy told me about the dual stage unit, which I like, added up parts and labor for a furnace, a/c unit, humidifier combo, the total was just over $7,000 This seems very expensive to me. Is this the going rate for a heating/cooling combo these days? Anybody in the K.C. area do side work that could beat this price?