View visual findings from this job here - https://visionshare.xoi.io/?id=XA-A243-338E5793BF2F4F9B909C094D8E323A34 Customer called in because they are hearing a loud rattling noise coming from the second floor unit: The system is off at arrival Call for heating from the nest thermostat in the master bedroom- The system turns on Immediately you can hear a buzzing Noise coming from the return grill Set up ladder and confirm that the screws are as secure as they can be- Going into old plaster ceiling The return grill is also larger than the return in the ceiling- When the screws were secured, you can hear the sound lower down Set up Ladder and access attic Confirm the 20 x 20 by one air filter is clean and clear Confirm no obstructions on the evaporator coil, Blower motor wheel or assembly The air handler is on and running with absolutely no abnormal noises up in the attic we’re coming from the equipment- The noise is solely at the return grill The return ductwork is completely covered i