The dope who previously owned my home or the dope who installed the furnace/AC snaked the AC condensation hose too far down the floor drain and caused the condensation water to back up and drain into my furnace. It seems they couldn't figure out what the problem was and just caulked the s*it out of the point where the water was leaking... which only worked for a little while. I snipped about 14 inches off of the hose and it drains fine now. However.. some damage has been done. The fan motor looks rusty and I can smell a faint hint of gas near the furnace. I don't know jack about furnaces and am leery of getting hosed by some contractor. Is there anything I can do to reduce my chances of getting raped financially?