Working on a house fire job a/c and furnace blower were running during fire drawing excessive heat and smoke through entire system including metal duct work furnace and coil. My recommendation is replace all metal duct for starters as I have been through this before and ducts are unable to be cleaned with a 100 % guarantee of no smoke smell. Furnace is a 80% efficient with a draft inducer which had water enter the windings along with smoke and furnace blower motor has smoke in the windings and armature so both would need replaced. To make an attempt at cleaning furnace would require complete disassembly of heat exchanger and cabinet, parts and labor would exceed cost of new furnace still with no guarantee of no smoke smell so replace furnace. The part I'm not sure about is the coil, condensor and lineset. Did the excessive heat crossing the coil cause any problem with the refrigerant causing contamination to the system which will later result in compressor failure or blockage of the txv valve? The reason for the last question is on a fire job several years ago we replaced the coil only and recharged the system with results of compressor failure in less than a week of running the system. Appreciate any help with this situation.