The door itself usually tells the story before the opener does. On a house with its original 1990-era door, you'll often see panels that have started to bow in the middle, rollers worn oval instead of round, and a torsion spring that's stretched past its coil spacing. None of that is dangerous by itself, but it's a sign the hardware is at the end of its rated cycle count. The bigger issue for this area is insulation. A lot of original doors from that build period are single-layer steel with no thermal break, which is a real problem once winter settles in - this region sits in a cold, severe climate band, and an uninsulated door turns the garage into an extension of the outside air. If you're noticing frost forming on the inside of the door or a noticeable temperature drop in the garage itself, that's the door, not the furnace.