AI-powered HVAC optimization for smart buildings

Erna Fastigheter is a growing Swedish property company focused on developing and managing sustainable residential and commercial properties. Working with Siemens, the company is using AI-powered HVAC optimization to improve indoor comfort while reducing energy costs.

Building on a strong digital foundation

Erna Fastigheter had already invested in modern building automation, including Desigo CC, Siemens PXC automation system and DXR room automation controllers. This provided a strong digital foundation for taking building performance to the next level.

Building X, Siemens’ digital building platform, builds on this infrastructure by turning building data into insights that help teams understand and improve performance.

For Erna Fastigheter, the next opportunity was to go beyond traditional building control and use AI to continuously optimize HVAC operation. Rather than relying solely on predefined settings and manual adjustments, the company wanted its buildings to respond more dynamically to changing indoor conditions.

Using Building X Comfort AI, Erna Fastigheter now continuously optimizes HVAC operation across 51 rooms on four office floors. The application analyzes building data and adjusts operation to help maintain comfortable indoor conditions while using energy more efficiently.

Erna Fastigheter Screenshot of Comfort AI dashboard

51 rooms continuously optimized with AI

HVAC operation across four office floors is continuously optimized, reducing the need for manual adjustments.

6.4% average monthly energy cost savings

Delivered over eight months by continuously optimizing HVAC performance with AI.

81% of indoor temperatures within expected comfort bounds

More consistent indoor conditions for occupants, up from 53% before implementation.

Erna Fastigheter - Screenshot of Console AI dashboard

Better comfort, lower energy costs

The pilot has delivered measurable improvements in both comfort and energy performance. Since implementing Comfort AI, indoor temperatures have remained within expected comfort bounds 81% of the time, compared with 53% before implementation. At the same time, Erna Fastigheter has achieved average monthly energy cost savings of 6.4% over eight months.

The benefits can also be felt in day-to-day operations. More consistent indoor conditions can mean fewer comfort-related service requests and less need for technicians to continually fine-tune HVAC settings manually.

This gives facility teams more time to focus on other priorities while AI continuously supports building performance in the background.

Creating value across the property portfolio

The benefits of AI-powered optimization extend beyond energy savings. For Erna Fastigheter, improving efficiency and indoor comfort supports its ambition to create sustainable, high-performing properties that deliver long-term value.

Improved energy efficiency can also support property certifications and sustainability-related financing requirements. Together with more consistent indoor comfort, these improvements help Erna Fastigheter create buildings that work better for occupants while supporting wider business and sustainability goals.

We operate complex building systems that need continuous optimization. With AI, we can automate much of that work, while creating more consistent indoor comfort for our tenants. We’re already seeing 6.4% energy savings, and our goal is to expand the solution across more of our portfolio and reduce the time our technicians spend on manual optimization.

Lars Hansbo, Operations Manager and Technical Facility Manager, Erna Fastigheter

A connected ecosystem of technologies and solutions

A combination of Siemens technologies and solutions works together at Erna Fastigheter to connect building data, automation and AI-powered optimization.

Scaling AI-enabled optimization across the portfolio

Following the successful pilot, Erna Fastigheter plans to expand Comfort AI to approximately 120 additional rooms already equipped with Siemens DXR room automation.

This next phase will extend the benefits of continuous AI optimization, helping maintain consistent indoor comfort and energy-efficient operations with less reliance on manual adjustments.

For Erna Fastigheter, it marks another step toward autonomous buildings that can respond and adapt to changing needs.

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