Describe the impact and the pattern
Tell the provider which rooms are affected, whether the noise is new, and whether it occurs at startup, throughout heating, or during shutdown. Compare heat and cooling behavior only from normal use, not by running repeated tests. Say plainly that the sound interferes with talking or sleeping.
Record the thermostat setting, when the furnace last changed, and any filter or control changes near the same time. A phone recording can document the character of the sound. It is not a calibrated sound test or a reliable diagnosis on its own.
Lennox notes that a sharp or worsening buzz can point to electrical or motor trouble. That is a reason for qualified investigation, not proof of a failed motor from the sound alone. Lennox buzzing-noise guidance.
Ask what has been verified
Request a check of the operating setup and the actual source of the noise. Ask whether the equipment is running in the intended mode, whether vibration is being transmitted from a component, and whether the airflow arrangement suits the model.
If someone proposes another furnace, ask why its sound performance and installation would address your complaint. A quieter product rating may not describe the noise reaching your living room through the existing installation. Ask what comparison method and conditions are being used.
If the cause is outside the equipment, such as an acoustic or duct dependency, request a separate scope and appropriately qualified provider. Do not assume equipment replacement includes that work or that MGI offers it.
Avoid changes that hide the cause
Do not block return grilles, seal the furnace closet, add insulation around the unit, or turn down internal fan settings to quiet it. Any sound-control proposal must preserve the equipment's required air, access, and clearances. Have the qualified installer confirm those requirements before materials or door changes are chosen.
Your next step is a noise-focused visit with an agreed observation point in the affected room. Ask for a finding, a proposed correction, and a way to compare the result under similar operating conditions.