As urbanisation accelerates, energy consumption in buildings is no longer just a matter of comfort — it’s a vital factor in sustainability. Among the many systems operating in multi-storey buildings, lifts account for a surprisingly significant share of total energy use.
This makes energy-efficient lift systems an increasingly important consideration in sustainable building design. But what exactly makes a lift energy-efficient? The answer lies in eco-conscious engineering combined with smart technologies — the hallmarks of Class A systems.
In this article, we explore how Class A systems function and how existing lifts can be upgraded to improve their energy performance.
Why Is Energy Efficiency Important in Lifts?
A lift system can account for between 2% and 10% of a building’s total electricity consumption. Operating hundreds of times daily, especially in commercial properties, lifts contribute substantially to energy costs.
Using energy-efficient lifts not only reduces operating expenses but also supports green building goals. Furthermore, energy performance plays a role in earning points for certifications such as BREEAM and LEED.
What Are Energy Efficiency Classes — and What Does ‘Class A’ Mean?
Lift energy classes are defined under the European standard EN ISO 25745-2, which measures annual energy consumption and ranks systems from A (most efficient) to G.
Class A indicates the most energy-efficient category. These lifts consume minimal electricity both in operation and in standby mode. To qualify, the entire system — drive mechanisms, lighting, and control units — must demonstrate high levels of efficiency.
What Technologies Are Used in Class A Lift Systems?
Achieving Class A status involves more than just an efficient motor. It requires a combination of technologies working in unison:
Regenerative Drives
When a lift moves, it generates kinetic energy. Rather than losing this as heat, regenerative drives recover and redirect it into the building’s power grid — reducing energy use by up to 30%.
LED Lighting and Auto-Off Features
LED lights use up to 80% less energy than fluorescent lamps. Auto-off functions that shut down cabin lighting when the lift is idle help further cut down energy waste.
Sleep Mode / Standby Operation
When inactive, systems such as the control panel, displays, and lighting automatically enter sleep mode. This saves energy, particularly outside working hours.
High-Efficiency Motors (PM Motors)
Permanent Magnet Synchronous Motors consume up to 25% less electricity than traditional asynchronous motors. They also run more quietly and require less maintenance.
Intelligent Control Systems
Smart algorithms analyse traffic patterns between floors, reducing unnecessary stops and delays. In group lift operations, such systems greatly improve energy efficiency and ride experience.
What Are the Benefits of Installing a Class A Lift System?
Additional advantages include quieter operation, longer lifespan, and lower maintenance costs.
Can Existing Lifts Be Upgraded to Class A?
Yes. Full system replacement is not always necessary — energy performance can often be improved with targeted upgrades. Adding regenerative drives, switching to LED lighting, and updating control software can significantly improve efficiency.
However, a detailed analysis and technical review are essential to meet full EN ISO 25745-2 certification.
Source:Elevator World Magazine, Improving Energy Efficiency in Vertical Transportation, 2022.