A Glass of Tap Water That Changed His Career

For many people, a career path is carefully planned.
For Duan Changshun, entering the HVAC industry began with a simple but unforgettable experience abroad.

Years ago, while working in the media industry, he traveled to Singapore for business. After checking into a luxury five-star hotel, he looked for bottled water as usual. The hotel staff told him something that surprised him:

“The tap water here meets drinking standards.”

“That moment made a huge impression on me,” Duan recalls.

He immediately sensed that improving residential living standards — including water quality and indoor comfort — would eventually become an important trend in China.

He started from the water treatment sector, gradually expanding into HVAC systems.

From supplying individual equipment to delivering integrated system solutions, he has remained in the industry for nearly twenty years.

The Confidence Behind a “Ten-Year Bet”

Many homeowners share the same concern about HVAC systems:

They may afford to install them — but can they afford to run them?

Duan’s response is simple and direct. He gives clients a bold guarantee:

“For a dual-supply system, I promise the monthly energy cost will not exceed RMB 8 per square meter.
For a hot water system in a 500 m² villa, the average monthly cost will not exceed RMB 200.”

And if the cost exceeds the promise?

“Then we compensate. For ten years.”

Behind this promise is his belief that HVAC is a highly technical discipline.

“Give the same house to different engineers, and the final result will definitely be different.”

Every system his team designs is tailored to the homeowner’s actual living habits, combined with precise engineering calculations to achieve the optimal balance between comfort and efficiency.

In one of his cases, the owner of a 500 m² villa barely needs to use air conditioning during summer, yet the monthly electricity bill remains around RMB 100–200, while indoor comfort remains exceptional.

Such results come from a deep understanding of building characteristics, system design, and component matching.

From Choosing a Brand to Growing Together

When talking about his cooperation with Earthmother, Duan uses one word:

Iteration.

He first encountered Earthmother during a technical exchange among industry peers, where the brand’s insulation materials were recommended to him.

At that time, the market for auxiliary materials was inconsistent in quality, making procurement and quality control difficult.

After working with Earthmother, he found that standardized products, continuously upgraded materials, and a growing insulation solution system significantly improved the overall performance and stability of his HVAC projects.

“Building the most energy-efficient systems is a principle deeply embedded in our DNA.”

This philosophy is also the reason he chose to work with Earthmother for the long term.

“Energy efficiency always begins with the building envelope. If insulation is done properly, the entire system will naturally become more energy efficient.”

What began as a simple supplier relationship has gradually evolved into something deeper.

“At the beginning, we chose a brand. Now it feels more like a partner evolving together.”

As Five-Constant systems and building envelope performance become increasingly important, Duan hopes Earthmother will continue innovating — especially in areas such as wall insulation and integrated building solutions.

The World Changes — Consistency Comes from Continuous Evolution

Looking back on nearly twenty years in the industry, Duan does not attribute success to a particular product or a single decision.

Instead, he believes in a simple principle:

True long-term commitment is not about staying unchanged — it is about continuously evolving.

Upgrading technologies.
Improving systems.
Enhancing service.
And strengthening trust with partners.

Earthmother is proud to grow alongside distributors like Duan — professionals who remain committed to technical fundamentals and genuine customer needs.

Our seemingly steady ten-year journey has never been static.
It has been a process of continuous evolution.

Not to chase trends —
but to create better living environments.