Same door, same part, different price
A torsion spring costs about the same in Boise as in Shreveport. Labour rate and climate explain almost the entire difference in what you pay.
Part prices barely move across the country - a torsion spring costs about the same in Boise as in Shreveport. What moves is labour rate and how quickly the local climate destroys hardware. Those two things explain almost the entire spread.
Part prices vary by under 10% across the United States, while installed prices vary by 40% or more, so the whole question is labour and climate.
Freeze-thaw days range from about 105 a year in Boise to under 20 in the southern United States, and rollers in the high-cycle cities are a 5-year part rather than a 10-year one.
In the humid southern United States lift cables typically fail at 8 years from rust, before the springs reach their 10,000-cycle rating.
Freeze-thaw is the quiet one
A day that crosses freezing twice does more damage than a day that stays at minus twenty. Water gets into roller bearings and track seams, freezes, expands, and works the clearance open a little further each cycle. Boise runs about 105 such days a year, Spokane about 95. In those cities rollers are a five-year part rather than a ten-year part, and a company that services doors there will tell you so unprompted.
Humidity attacks a different part
On the Gulf coast the springs often outlast the cables. Lift cables are steel, they run close to the floor where the damp sits, and rust takes them long before the cycle count does. A Shreveport door is more likely to fail with a crooked hang than with a bang.
Dry heat bakes the parts you can see
In the desert southwest the hardware lasts well and the visible parts do not. Weatherstripping goes brittle and cracks, composite panels on the south-facing door warp, and paint chalks. None of that stops the door working, which is why it gets deferred - and why replacement panels for a discontinued door become the expensive conversation five years later.
| Climate | What fails first | What to budget for |
|---|---|---|
| Freeze-thaw (Boise, Spokane) | Rollers and bearings | Roller set every 5-7 years, $120-260 |
| Humid Gulf (Shreveport) | Lift cables | Cable pair every 8 years, $150-300 |
| Hard winter (Sioux Falls) | Opener under load | Opener at 10-12 years, $420-780 |
| Dry heat | Weatherstrip and panels | Seal replacement every 4-6 years, $90-180 |
The practical version: ask a local company what fails first around here. If they have an immediate, specific answer, they work on these doors every week. If the answer is generic, keep calling.
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