Arrived to inspect a system and provide a second opinion on the status of the equipment. Homeowner had another company out and they provided some high estimates for repairs to be performed. Inspected the system and can confirm that the ductwork is dirty and the system is choked up trying to breathe through the dirty and undersized ducts. Inspected the outside unit and found that the condenser coil is heavily coated in debris. Inspected the furnaces heat exchanger and found that it is damaged and venting flue gas in the airstream. This makes the furnace unsafe to operate in heat mode. Rinsed off the condenser coil because this is something we would normally take care of during a maintenance. It’s also one less thing to worry about. Reached out to a field supervisor to bundle repairs and provide repair and replacement solutions. System is still cooling at this time.