Garage door springs come in two styles: torsion (see above), which mounts on the header above the door, and extension (Photo 1), which floats above the upper roller track. In the past, extension springs were safer to install but didn’t have containment cables running through the center of the spring. Without cable, these springs become dangerous, heavy whips when they break. They also tend to be noisier than torsion springs, and we recommend you use them only if you don’t have the 12 in. of headroom above the door that a torsion spring requires.


Finally, one of the most important garage door innovations over the years in increased child safety features. Sensors can detect when a child or pet is crossing the threshold while the door is closing, prompting it to stop immediately. Furthermore, doors can also sense when something is being pressed by the door, causing it to stop before inflicting a brutal crushing injury.

Safe automatic door openers. All automatic openers must now have an auto-reversing mechanism and photoelectric eyes located near the floor on both sides of the door (see photo). If the door is closing and the beam between the eyes is interrupted, the door will automatically reverse. If the eyes aren’t connected, the door won’t operate. For instructions on how to install a new garage door opener, see How to Install a Garage Door Opener.
While a sudden issue is usually easily repaired, a consistent issue that has gone unaddressed for months or years will likely require a total replacement. The problem is that garage doors have a number of heavy, powerful moving parts. If the door is working as it is designed, it can open and close hundreds and hundreds of times without issues. However, if there is even a small issue in the lifting mechanism that repeatedly influences the movement of the door, you will soon find that the damage caused over those hundreds of lifts can’t be fixed.

Whether it’s a large commercial project or a single residential garage door installation, you can be sure Cornwell Door Service will get the job done right. Our team has a combined 120 years of experience and receives extensive training both on the job and off. This ensures we are fully capable of working with the newest and most advanced products on the market today. As an authorized installer for several leading manufacturers, we are trusted by some of the largest names in our industry, in part because we have made the commitment to excellence they require.
Cornwell Door Service has more than 40 years of experience providing garage door installations in Harrisburg, Lebanon, Camp Hill and throughout the South Central PA area. We complete all projects to a high standard of quality, with respect for your budget and your property. Working with leading manufacturers such as Clopay® and Wayne Dalton, we specialize in turnkey service that includes helping you select the right door and opener for your needs, performing the installation, and backing our work with long-term support and maintenance.
Furthermore, newer doors come with more improved security features, helping to improve the way you protect your home and loved ones. While older doors are easy to break into, whether through breaking the lift mechanism or even using a universal garage door remote, new doors come with many redundant security features, which will go a long way in deterring even the most ingenious burglar.

Garage Door Opener

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