We offer four standard insulation options for our most common steel garage doors, each with its own benefits and price point:   No Insulation (budget-friendly) $ 2in Vinyl Back Insulation (best value) $$ Sandwich Door with Polystyrene Insulation (Better) $$$ Sandwich Door with Polyurethane Insulation (Best) $$ If your garage is attached to your home, we strongly recommend opting for at least the 2in Vinyl Back Insulation option. This will provide moderate insulation and noise reduction without breaking the bank. For those looking for even greater insulation and noise reduction, our Sandwich Door options with Polystyrene and Polyurethane Insulation are both excellent choices.