Upon arrival customer showed me location of filter thermostat and indoor and outdoor. System has seemed to be operating properly with no issues brought up. When adjusting thermostat to test heat strips they were amping properly at 18. Amps. When looking at the blower wheel there was an accumulation of dust would recommend cleaning to prolong life and improve efficiency. When inspecting blower amps were in correct range at 1.25. When inspecting coil could see build up around the coil would recommend cleaning the coil and possibly adding photo max to help clean and prevent growths. When inspecting outdoor unit could see low voltage wiring sheathing was crack exposing the wires do recommend replacing to prevent any possible shorts. Outdoor coil is dirty with dust and debris pressure readings are inaccurate do to cleanliness. Did see some charing on contactor but all electrical connections were tight. Would also recommend surge protector for indoor and outdoor to help keep electrical c