Case Studies 

Trusted by Developers like CDL
“Working with GRAM Tech has been a game-changer for City House. Their integration with our existing BMS allowed us to optimize HVAC operations with minimal but manageable disruptions to our tenants. GRAM’s expertise and innovative approach have not only enhanced our energy efficiency but also reinforced our commitment to sustainability, and the results speak for themselves. "
Lim Ke-VinHead, Group Innovation, City Developments Ltd

Case Study #1

City House – Smarter HVAC, Greater Savings

City House is a 23-storey office building owned by City Developments Ltd (CDL), prominently located in the heart of Singapore’s central business district. Known for its strong commitment to sustainability, the building was awarded the prestigious Green Mark Platinum Super Low Energy Award by the Building and Construction Authority in 2024.

Despite already being a high-performing green building, CDL challenged GRAM to further enhance City House’s energy performance — specifically by reducing HVAC energy consumption without disrupting tenant operations or comfort. GRAM Tech rose to the challenge by tapping into the building’s existing BMS, leveraging CDL’s robust data acquisition infrastructure to avoid the need for additional IoT hardware.

This collaboration enabled a full-building deployment in under three months, demonstrating both the agility of GRAM Tech and the digital readiness of CDL’s assets. Once deployed, GRAM’s AI-powered software began continuously optimising HVAC operations in real time, adapting to the building’s thermal behaviour and usage patterns.

The outcome: a 16% reduction in chiller system electricity consumption and a 4% improvement in overall chiller plant efficiency—delivered with minimal disruption to tenants.

“With the implementation of GRAM technology, we observed a clear and measurable reduction in the building’s cooling load. What stood out to us was how seamlessly it worked with the existing systems — no additional devices were needed, and there was no disruption to tenants. The optimisation translated into tangible energy savings across both the water side and air side of the air conditioning system, which is a meaningful step forward in advancing building efficiency.”
Irene YongTechnical Director (Building Services), Beca

Case Study #2

Proof-of-Value: Elevating HVAC Efficiency in a Green Mark Platinum Office

GRAM conducted a proof-of-value (POV) in a Green Mark Platinum Business-One building of approximately 800,000 square feet to demonstrate how its technology could optimise HVAC performance while working seamlessly with existing systems. The study was designed to showcase measurable energy savings without requiring additional IoT devices or causing any disruption to the building management system or tenants.

The results, independently audited by Beca, showed clear and significant improvements:

  • 19.6% reduction in chiller system cooling load
  • 18.1% savings in electricity consumption for chiller plant

These outcomes demonstrate how GRAM Tech can deliver meaningful energy reduction while maintaining operational comfort and system integrity.