Haier unveils 4Hz ultra‑low frequency central air conditioning
Haier has announced the industry's first central air conditioning system capable of stable operation at 4Hz, a breakthrough that cuts electricity costs by up to half compared to conventional systems. The technology was unveiled at Haier's household central air conditioning lighthouse factory on December 17, 2025.
Traditional 6Hz systems often oversupply cooling in small spaces like bedrooms, forcing compressors to repeatedly start and stop. This not only wastes energy but also causes uncomfortable temperature fluctuations and noise. Haier's new 4Hz technology allows compressors to run continuously at ultra‑low frequency, delivering just the right amount of cooling power.
The benefits are clear:
- Energy savings: Tests show nighttime bedroom cooling consumes only about 1.5 kWh over 8 hours, compared to 1.52 kWh for a top‑tier wall‑mounted unit - making it even more efficient than standard split systems.
- Stable comfort: Continuous operation eliminates the "cold burst then stop" cycle, keeping room temperature steady.
- Quiet performance: Operating noise drops to just 16 dB(A), equivalent to a baby's breathing, blending into background sound during sleep.
Haier emphasizes that this advance is not just about technical parameters but about real user experience - combining comfort, energy efficiency, and silence. All 4Hz products are manufactured at the company's lighthouse factory, which uses highly digitalized and intelligent processes to ensure reliability. Haier also provides nationwide professional service, from tailored design to standardized installation and long‑term smart maintenance.
Haier Group, founded in 1984 and headquartered in Qingdao, China, is one of the world's largest home appliance manufacturers. The company operates globally under brands such as Haier, Casarte, and GE Appliances. Known for its innovation in smart home and energy‑efficient technologies, Haier has consistently invested in advanced manufacturing and service systems. Its central air conditioning division has become a leader in developing ultra‑low frequency compressor technology, aiming to redefine comfort and sustainability in modern households.
