Greeted Michael at the entrance door. We had a brief conversation and proceeded to the basement to inspect the furnace. Began with the filter and it was severely dirty and sucked into the motor. Could not replace it as the owner had none. Opened up the furnace cabinet and inspected all electrical electrical wiring, connections, pressure switches, condensate pump. Checked out the two roll out safety switches as well. Removed the flame sensor and sanded it clean. Fired up the furnace. Allowed the unit to cycle and reach temperature. All is well with the furnace mechanically. Upon close inspection of the ductwork system, we are recommending a complete ductwork cleaning with the furnace blower assembly. We are also recommending the electronic filter installation in order to facilitate and reduce maintenance to the ductwork. And finally after working up several options and having a conversation with Michael, it was decided, to also include a humidifier system with the work being performedâ€