Garage Door Opener Buying Guide: Belt, Chain or Wall-Mount, Battery Backup (SB 969), Horsepower and Smart Features

Belt, chain, screw or wall-mount: the four drive types

Belt, chain and screw drives are rail openers: the motor hangs from the ceiling and a trolley on the rail draws the door up and down. A wall-mount unit sits beside the door instead and turns the shaft that carries the torsion springs. Manufacturers’ buying guides compare them like this:

Rail openers need ceiling space above the door’s travel, and the instructions federal rules require ask for the opener to be mounted seven feet or more above the floor where possible; a tall door may need a rail extension. A wall-mount unit has no rail, so it leaves the ceiling clear and suits high-lift and vertical-lift track. It is not automatically the fix for a low ceiling, because some models exclude low-headroom setups, so check the clearances in the manual.

If anyone sleeps, works or relaxes over or beside the garage, noise decides it: a belt drive, or a DC chain unit with soft start and stop, which Genie calls much quieter. In a detached garage, chain noise matters less.

Horsepower, DC ratings and heavy doors

Choose capacity for a door the springs already balance; horsepower is not a fix for a heavy door. The springs carry the weight and the opener moves a balanced door, which is why federal rules require every opener’s instructions to say to install it only on a properly balanced door. DASMA is blunt about a door that takes two hands to lift: it is probably out of balance, and the answer is not a more powerful opener.

AC motors are rated in horsepower; DC motors are not, so makers publish comparison figures. Chamberlain’s buyer’s guide lists its DC tiers as equivalent to a horsepower class and says the figures are for comparison only; Genie says its HPc ratings are a basis for comparing openers, not an equivalence. Use them to compare models within one maker’s range. Across brands, compare the maximum door weight and height each opener is listed for.

Makers size openers in steps. Chamberlain matches its half-horsepower-equivalent tier to sectional aluminum doors in standard use, its three-quarter tier to busy garages with several drivers, and its top tier, equivalent to 1¼ HPS, to heavier or one-piece doors. Genie’s buying guide puts a half-horsepower opener on a standard single-width aluminum door, calls for three-quarter horsepower or more for frequent use, one-piece doors and heavy oversized doors, and warns that an opener able to lift a multi-piece aluminum door may not lift a single-piece wooden one.

Weight is the number to start from. DASMA’s range for doors runs from about 90 pounds to over 500, and Genie says size, material, thickness, insulation and glass set the figure, adding that older and wooden doors can weigh significantly more. For a heavy wood or glass door, size the springs to its actual weight, check that the opener’s listed capacity covers it, and look at the drives makers point to for heavy doors: chain, screw, or a wall-mount unit rated for the load.

Extra capacity is not wasted: Chamberlain says a motor with more lifting power does not have to work as hard and will typically last longer. It never substitutes for springs, though. If the door feels heavy by hand, start with our spring replacement guide.

Battery backup and SB 969

California requires battery backup on residential openers. Since July 1, 2019, Health and Safety Code §19892, the rule known as SB 969, has barred making for sale, selling, offering or installing a residential automatic garage door opener in the state unless it has a battery backup function built to keep it running through a power outage. It reaches commercial-type openers used at a home, and a replacement door may not be hooked up to an existing opener that lacks backup, whatever the opener’s age. Section 19891 sets a civil penalty of $1,000 per noncompliant opener.

Three limits are worth knowing. The rule does not make you replace a working opener that predates it; only a new door brings the old opener into question, which is how Chamberlain reads it too. It does not cover driveway gates, because the chapter defines a garage door as an overhead, vertically moving barrier and excludes structures that slide or move horizontally. And it applies to a residence, which the chapter defines as a building with one to four single-family dwelling units, the same line the federal opener standard draws. Our power-outage guide reads the statute in full.

What to ask before you buy:

• Built in or added on? Chamberlain offers backup only on DC-motor openers, because batteries supply DC power, and says some models include it while a few take it as an add-on.
• What runs on battery. Run time and which features stay on vary by model; the manual has the figures.
• The battery’s life. Chamberlain puts a backup battery at about one to two years of normal use, signals a weak one with a beep and a red status light, recommends its own replacement batteries, and suggests disconnecting the battery when a second home’s opener will be unplugged for a long time.
• How to test it. DASMA’s checklist test: with the door closed, unplug the opener and run the door up and down from the wall control or a remote.

Replacing the door as well? The old opener can stay only if it has battery backup and, under a California rule in force since 1992, passes the two-inch reversal test described below. Garage door installation covers the door side.

Photo eyes and the reversal test

Every residential opener made for sale in the United States since January 1, 1993 must reverse on contact and carry a second safety device, and both are yours to test. Under 16 CFR Part 1211, a closing door that strikes something must begin to reverse within two seconds. The second device is usually a pair of photo eyes, though the standard also allows edge sensors and other equivalent devices. The opener checks that device on every close; if it is missing or faulty, a closing door reverses and an open door will not come down. California has required the second device since the same date, including reversal when the eyes are knocked out of line or their wiring opens or shorts.

A new opener comes with its eyes, so placement is what matters: DASMA’s checklist and safety tips put the beam no higher than six inches above the floor. Three tests keep the system honest:

1. 1Monthly, by you. The instructions federal rules require say the door must reverse on contact with a 1½-inch object on the floor, such as a 2×4 laid flat. If it does not, the required warning label says to adjust, repair or replace the operator.
2. 2The beam. As the door closes, pass an object through the beam: DASMA’s checklist expects the door to reverse and open fully, and its owner’s guide says the door should not close with the beam blocked unless you hold the wall button down.
3. 3After any service. California requires anyone hired to service or repair a residential opener to test it against a rigid two-inch obstacle, and to attach a red warning certificate to an opener that fails.

An opener with no photo eyes or other second device predates these rules, and DASMA’s advice is to replace it. A door that reverses on its own points first to the eyes; our troubleshooting guide walks through the checks.

Smart and app control

You can run a door from your phone with a Wi-Fi opener or with a retrofit hub added to the opener you have; closing it out of sight brings federal rules on warnings. A hub depends on the existing opener: one maker lists most openers made after 1993 with standard photo eyes as compatible, but not those whose sensors switch off. Check the Wi-Fi signal where the opener hangs before you buy; Chamberlain asks for about 75 percent strength in the garage.

Useful features include an alert when the door opens or is left open, opening and closing from anywhere, schedules, guest access and an activity log. Some openers also have a vacation lock that shuts out wireless remotes while you are away.

Closing the door when you cannot see it is what the federal standard calls unattended operation. It has to be switched on deliberately. Before the door moves, the system must flash and sound an alarm for at least five seconds, and pressing the wall control, a remote or the keypad during the warning cancels the close. If the safety system stops and reverses the door, the opener may try once more; after two attempts it stops until someone uses a regular control. Unattended closing is not permitted on one-piece or swinging doors, and the required instructions warn to enable it only on a sectional door.

On the radio side, rolling-code remotes change their code each time they are used, which DASMA notes stops a thief from replaying a recorded signal. Keep remotes where children cannot play with them.

Sharing a remote between the gate and the garage

One remote or car button can run both only when the gate operator and the garage opener understand the same radio signal. Within one maker’s system that can be simple: one opener maker lists a three-button remote for up to three garage door openers or gate openers on its own secure radio system, with a compatible receiver at the gate.

Car buttons are the other route. HomeLink, the system behind many cars’ built-in buttons, works with devices between 288 and 433 MHz using fixed or rolling codes, gates included. Each button is trained from that device’s own handheld remote or wireless keypad, so you need one for each. Some newer openers need a bridge accessory or training from their original remote, and some older ones have drifted outside the band. Keep people and cars clear while programming, because doors and gates can move.

When the radios cannot be shared, the answer is separate remotes or a receiver added on one side. We work on residential gate openers as well as garage doors, so we look at both systems before you choose; our garage door opener installation page explains how that check fits the visit.

Before you buy: the door, the ceiling and the outlet

Check the door’s balance, its locks, the ceiling, the power and the control positions before you choose an opener:

1. 1Balance. A technician checks that the door lifts freely by hand and stays put three to four feet off the floor, as DASMA’s checklist does. If it does not, the springs come before the opener.
2. 2Locks and ropes. The federal installation instructions call for removing pull ropes and removing or disabling any lock connected to the door before an opener goes on.
3. 3Ceiling and headroom. A rail opener needs room above the door’s travel, and a tall door may need a rail extension. A wall-mount unit needs torsion springs and the clearances its manual lists.
4. 4Power. DASMA’s checklist calls for a grounded or GFCI outlet within reach of the opener’s cord and says extension cords are not permitted.
5. 5Controls. Plan the wall control where you can see the door, at least five feet above the floor and clear of moving parts, and decide where an outdoor keypad would go.

Then the opener can be matched to the door, the room above and the gate. What the visit includes is set out on our garage door opener installation page, and a new door at the same time is garage door installation.