advice from the HVAC device, seek professional help, being attentive to what sort of audio you happen to be hearing and any thoughts you have about what may very well be producing it. If your HVAC is generating loud sound, this is the warning sign to you.Roaring or rumbling sound. Should the system is in heating mode, noises originating on the furnace burner may well seem like roaring or rumbling.Yet another common HVAC noise is rattle. This could mean that your compressor is failing. In addition it could a pulley with failing bearings. Or it may be a worn-out compressor advice clutch. Any person of those problems warrants the eye of an HVAC technician.