Name the sound you want to reduce
Write down whether the concern is passing vehicles, voices outside or the door’s own movement. This gives the supplier a clear target. A replacement conversation about outside sound should address the closed opening; an operating-noise repair should address the moving system.
Ask for the relevant acoustic information
DASMA describes Sound Transmission Class (STC) and Outdoor to Indoor Sound Transmission Class (OITC), which assess different sound conditions. Ask which rating and tested configuration the manufacturer provides. A high insulation R-value is not itself an acoustic rating, and an absorption claim is not the same as transmission reduction.
Look beyond the section brochure
Have the proposal address the complete installed opening and any remaining gaps or adjacent paths for sound. Ask what the proposed work can reasonably change. Avoid a promise of silence based on foam thickness, and compare products using equivalent evidence.
Your questions
Will an insulated door automatically make the garage quiet?
No. Thermal construction alone does not establish an acoustic result. Request sound data and discuss the rest of the opening.
Is this the same problem as a loud chain-drive opener?
No. Machinery noise during operation is a separate diagnosis from outside sound entering through a closed garage.