| How It Works | An electric motor turns a threaded vertical screw. A traveling nut attached to the elevator platform moves along the screw to raise or lower the lift. | An electric motor turns a drum that winds or unwinds a lifting cable connected to the elevator car. |
| Typical Layout | The screw and drive are commonly arranged within or alongside the lift shaft. Some designs do not require a separate machine room. | The drum and drive are generally positioned above the shaft or in a designated equipment area; the exact arrangement depends on the design. |
| Space Considerations | Can suit homes where a compact shaft arrangement is preferred. The screw assembly occupies space along the lift’s travel path. | Can be configured for residential spaces, but the drum, cable path, and required overhead clearance must be accommodated. |
| Ride Characteristics | Travel is often relatively steady at modest residential speeds. Sound from the motor and screw may be noticeable, depending on installation and upkeep. | Ride smoothness depends on the drive, cable arrangement, and controls. Starting, stopping, and operating noise vary by system design. |
| Common Applications | Often considered for low-rise home lifts, including installations where a conventional hydraulic system or machine room is not preferred. | Often considered for low-rise residential lifts where a cable-and-drum arrangement fits the building layout and lift requirements. |
| Maintenance Focus | Maintenance may include inspection of the screw, traveling nut, drive, guides, and safety components, following the manufacturer’s service schedule. | Maintenance may include inspection of the lifting cable, drum, drive, brakes, guides, and safety components, following the manufacturer’s service schedule. |
| Design Considerations | Capacity, travel height, speed, noise, and available space depend on the specific model and installation. | Capacity, travel height, cable arrangement, overhead space, and whether a counterweight is used depend on the specific design. |
| Safety and Compliance | Must include appropriate safety features and be installed and maintained in accordance with applicable local codes and regulations. | Must include appropriate safety features and be installed and maintained in accordance with applicable local codes and regulations. |