If you're calling us about installation rather than repair, it's usually one of a few things: the door is original to a house built decades ago and simply worn out, the opening was never fitted with insulation and the utility bill or the cold garage is finally annoying enough to fix, or a repair estimate came back and replacing made more financial sense than parts on an old frame.
With 55,707 owner-occupied houses across this service area and a median build year sitting well into the 1980s, a lot of these doors are hitting the same age wall around the same time. If your panel has visible rust-through at the bottom section, the seal is cracked and stiff instead of flexible, or the door feels noticeably heavier to lift by hand than it used to, that's consistent with what a cold-climate door looks like near the end of its life rather than something a spring adjustment fixes.