Arrived to remedy an inoperable system. Performed diagnostic on the system and found that the fan motors bearings are failing. Found that the inducer is rattling and the bearings on that motor are failing as well. Found that the furnace fan is heavily coated in debris. Found that the evaporator coil is impacted with debris. Found that the thermostat is no longer relaying signal to create a call for heat. With homeowners approval replaced the bad thermostat. Showed homeowner how thermostat operates. System is operating upon departure.