Spring repair in Tooele, Utah

Elevation is the quiet driver: Tooele's 5,020 feet buy it 102.9 freezing crossings a year, and each one flexes the coil like a small unpaid cycle. A door used twice a day and a door used ten times age differently — but both springs live in the same Tooele winter.

Cold adds a second effect: low temperature reduces the fracture toughness of spring steel, so a fatigued spring is likeliest to let go on the first lift of a freezing morning. That is when Tooele spring calls cluster — 90% of the year's freeze–thaw days here fall between November and March.

half the homes in Tooele were standing by 1994, so the housing stock mixes doors on original springs with doors already on replacements — which is why neighbouring houses fail years apart.

Upgrading to 25,000-cycle springs costs $80 to $150 more and roughly multiplies life by 2.5. With 102.9 freeze–thaw cycles a year working on the steel in Tooele, the upgrade turns a 5–7-year spring into one most owners never replace again — one invoice instead of two.

Whatever the rating, it goes on as a pair and it gets sized to the actual door weight. Cut-price undersized springs fail fastest exactly where winters are hardest.

The measurements shift town by town: Grantsville runs 93 freeze–thaw cycles and 5–7 years of spring life; Magna runs 84.5 freeze–thaw cycles and 5–7 years of spring life; and Herriman runs 102.2 freeze–thaw cycles and 5–7 years of spring life.

Against that backdrop, Tooele holds 102.9 cycles at 5,020 ft with a 1994 median build year — the specific inputs behind every figure above.