Do insulated garage doors really make a difference?

Yes, insulated garage doors make a measurable difference, especially on attached garages or in extreme climates. A polyurethane-injected door with an R-value of 12 or higher slows heat transfer in both directions, which keeps an attached garage 10 to 20 degrees closer to indoor temperature and reduces strain on adjacent rooms. Beyond temperature, insulation makes the door noticeably quieter when opening and closing, dampens street noise inside the garage, and stiffens the panels so they resist denting and wind better. The energy savings alone usually will not pay back the upgrade quickly on a detached garage, but for an attached garage, workshop, or any space above living quarters, the comfort and durability gains are clearly worth it.