Torsion vs. Extension Springs

By the Chandler Garage Door Experts team · Updated September 2026

What the Two Systems Look Like

Stand inside the garage and look up. If there is a steel shaft running horizontally above the opening with one or two springs wound around it, that is a torsion system. If instead you see long springs stretched along the horizontal tracks on either side, running parallel to the ceiling, that is an extension system. Both exist to counterbalance the door's weight so that it is nearly weightless to move.

The opener is not what lifts the door. It is a positioning motor built to move a door the springs have already balanced. That distinction explains most of what follows, including why a failed spring instantly makes a healthy opener look broken.

Why the Difference Matters in a Desert Garage

Springs are rated in cycles rather than years, and a cycle is one open and one close. In most Chandler households the garage is the way everyone comes and goes, so a door can easily run several cycles a day without anybody thinking of it as heavy use. A spring sized to a builder's standard rating on a house finished in 2002 has had a long time to work through that budget.

Heat does not shorten a spring's cycle life directly, but everything around it suffers. Dry air pulls lubricant out of bearings, dust settles on the shaft, and a roller that has started to bind adds load the spring was never sized for. That is why a spring failure so often arrives alongside worn cables or a dragging door.

What a Replacement Spring Has to Match

A replacement is not chosen by appearance. Wire diameter, inside diameter, length and wind direction all have to suit the specific door, its height and its lift arrangement. Two coils that look identical on a shelf can be rated for very different loads, and a near-enough spring will either leave the door heavy or wear out early.

On a two-spring door, both have carried the same load for the same number of cycles. Replacing one and leaving the other usually buys a second call-out within months, which is why replacing the pair is the normal recommendation rather than an upsell. If the door runs constantly, ask about a correctly rated higher-cycle spring and what the written warranty actually covers.

Signs a Spring Has Already Failed

The classic sign is a bang loud enough to be heard inside the house, followed by a door that will not lift. Looking up, you may see a clear gap in one of the coils above the opening, or on an extension system a spring hanging slack beside the track. Sometimes there is no visible clue at all and the only symptom is an opener that strains, moves the door a few inches and stops.

Why This Is Not a Do-It-Yourself Repair

A torsion spring stores a great deal of energy even with the door closed, and releasing that tension without the correct winding bars and technique causes serious injuries every year. Extension springs are no safer: a stretched spring that lets go can travel across a garage. Containment cables help, but plenty of older doors do not have them.

Questions Worth Asking Before Approving Spring Work

Ask which system is fitted and what determines the correct replacement for your door. Ask whether both springs are being changed and why. Ask what condition the cables, drums, bearings and rollers are in, because those are the parts that decide how long the new spring lasts. Ask what is tested at the end — balance by hand and a full travel cycle, not just a single press of the button.

What You Can Safely Note Down

From outside the door's path, record whether it is open, closed or stuck partway. Note what you heard and whether the opener was running at the time. If you can see a gap in a coil from a safe distance, that is useful, but do not climb beside the shaft or move hardware to get a better look.

Spring Service Around Chandler

Most of the doors we see in Chandler come from the build-out of the 1990s and 2000s, and they tend to arrive at this point together: original springs, original rollers, original opener. That is not a sales pitch, it is just what happens when a whole neighborhood is finished within a few years of each other. It is also why an inspection that looks only at the broken part is not much use.

The same pattern runs through the neighboring communities we cover. If you are in south Chandler, our page on garage door repair in Ocotillo covers local appointment details, and the service areas page lists the rest.

Arrange an Inspection

Chandler Garage Door Experts can identify the spring system, check what else has worn alongside it and quote the work before starting. Read more about spring repair, weigh a larger job with the repair versus replacement guide, or request a visit. Keep the door unused until it has been seen, and ask for the scope in writing before you approve it.