05/06/2026
𝐒𝐎𝐍𝐆𝐙 𝐓𝐨𝐩𝐬 𝟒𝟎,𝟏𝟓𝟏 𝐁𝐮𝐬 𝐇𝐕𝐀𝐂 𝐃𝐞𝐥𝐢𝐯𝐞𝐫𝐢𝐞𝐬 𝐢𝐧 𝟐𝟎𝟐𝟓; 𝐄𝐥𝐞𝐜𝐭𝐫𝐢𝐜 𝐔𝐧𝐢𝐭𝐬 𝐀𝐜𝐜𝐨𝐮𝐧𝐭 𝐟𝐨𝐫 𝟕𝟓% 𝐨𝐟 𝐓𝐨𝐭𝐚𝐥 𝐕𝐨𝐥𝐮𝐦𝐞, 𝐋𝐌𝐃 𝐒𝐞𝐜𝐮𝐫𝐞𝐬 𝐕𝐨𝐥𝐯𝐨 𝐄𝐕 𝐂𝐡𝐚𝐬𝐬𝐢𝐬 𝐇𝐕𝐀𝐂 𝐂𝐨𝐦𝐩𝐚𝐭𝐢𝐛𝐢𝐥𝐢𝐭𝐲 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐜𝐚𝐭𝐞
Headquartered in Shanghai and publicly listed, leading bus thermal management system supplier SONGZ released its annual business data at Bus2Bus Berlin 2026. The firm posted total bus HVAC deliveries of 40,151 units in 2025, among which electric heat pump systems reached 30,394 units, making up 75% of full-year sales. The figure reflects a steady sales recovery, with electric HVAC becoming the company’s core revenue source.
Starting from annual output of just 285 units in 1999, SONGZ hit its all-time peak of 60,356 bus AC units in 2017. From 1998 to 2025, cumulative global deliveries exceeded 761,000 bus air conditioning units, including over 307,195 all-electric HVAC products. Spurred by global decarbonisation rules, demand for traditional diesel-driven bus AC keeps falling, with only 9,757 units sold in 2025. Bus operators across Asia, Europe and Latin America are phasing out inefficient diesel cooling systems and switching to high-efficiency electric heat pump products.
𝗞𝗲𝘆 𝗖𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝗰𝗲 𝗠𝗶𝗹𝗲𝘀𝘁𝗼𝗻𝗲: 𝗜𝗦𝗢/𝗦𝗔𝗘 𝟮𝟭𝟰𝟯𝟰:𝟮𝟬𝟮𝟭 𝗖𝘆𝗯𝗲𝗿𝘀𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗢𝗯𝘁𝗮𝗶𝗻𝗲𝗱 𝗝𝘂𝗻𝗲 𝟮𝟬𝟮𝟰
SONGZ obtained certification to ISO/SAE 21434:2021 Road Vehicles – Cybersecurity Engineering in June 2024.
𝗧𝗵𝗿𝗲𝗲 𝗠𝗮𝗷𝗼𝗿 𝗟𝗼𝘄-𝗚𝗪𝗣 𝗥𝗲𝗳𝗿𝗶𝗴𝗲𝗿𝗮𝗻𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀
To comply with EU F-Gas rules and UK TFL refrigerant limits, SONGZ has achieved three key commercial milestones for eco-friendly HVAC between 2025 and 2026:
1. Bulk supply of R1234yf electric AC to Italian bus operators: R1234yf low-GWP heat pump AC complying with Italy’s updated F-Gas standards has been delivered in large batches to local bus companies. After Italy banned high-GWP refrigerants nationwide from 2025, R1234yf has become the standard option for newly built zero-emission urban buses.
2. Custom R744 (CO₂ transcritical) dedicated production line started operation in May 2026: The purpose-built automated production line for CO₂ natural refrigerant bus HVAC went into formal production this May.
3. R290 prototype completed in June 2026 and under ongoing testing: SONGZ finished production of its ultra-low-GWP R290 (propane) AC prototype in June. The unit is now undergoing bench and road tests to meet upcoming EU low-carbon bus tender requirements.
𝗙𝗹𝗮𝗴𝘀𝗵𝗶𝗽 𝗟𝗠𝗗 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝗢𝗯𝘁𝗮𝗶𝗻𝘀 𝗩𝗼𝗹𝘃𝗼 𝗘𝗩 𝗖𝗵𝗮𝘀𝘀𝗶𝘀 𝗛𝗩𝗔𝗖 𝗖𝗼𝗺𝗽𝗮𝘁𝗶𝗯𝗶𝗹𝗶𝘁𝘆 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗲 (𝟮𝟴 𝗠𝗮𝘆 𝟮𝟬𝟮𝟲)
On 28 May 2026, SONGZ’s flagship rooftop LMD electric HVAC received the official Volvo EV Chassis HVAC Compatibility Certificate from Volvo Buses, allowing fitment on all of Volvo’s 8–12 metre urban and intercity electric buses.
The product supports integrated BTMS (Battery Thermal Management System), ultra-low-temperature heat pumps working reliably at ambient temperatures as low as -15°C, plus integrated motor cooling and waste heat recovery functions.
By end-2025, global installed quantity of LMD series exceeded 50,000 units, widely used across Europe, Latin America, Southeast Asia and China.
𝗚𝗹𝗼𝗯𝗮𝗹 𝗠𝗮𝗻𝘂𝗳𝗮𝗰𝘁𝘂𝗿𝗶𝗻𝗴 & 𝗦𝘂𝗽𝗽𝗹𝘆 𝗖𝗵𝗮𝗶𝗻 𝗟𝗮𝘆𝗼𝘂𝘁
Backed by its listed status and three overseas production bases, SONGZ is gradually advancing localised global R&D, production and nearby delivery. The company can fully satisfy UKCA, ECE R10/R100, PSVAR and TFL V2.7 regulatory requirements for European and UK bus procurement, while providing local warehousing and after-sales service for global OEM partners.
For detailed product and certification information, visit SONGZ official website, LinkedIn and Facebook corporate pages.
