Integration of lighting control devices and HVAC systems can reduce HVAC energy consumption by up to 20%–30%. This has made it a new front in the ongoing battle to maximize energy savings in commercial buildings as demand for electric power continues to increase with strong growth in infrastructure. While integration traditionally occurred using a building automation system (BAS) or on/off contact-closure interface, the introduction of Bluetooth NLC smart thermostats, interoperable with Bluetooth NLC sensors, promises to simplify integration and expand opportunities to save energy.

Integration opportunity 

In many buildings, the HVAC system conditions spaces even when they are unoccupied. This creates an opportunity for occupancy sensors to signal the system that it is vacant, which enables it to reduce space conditioning by reducing it to a setback level or turning it off.

Traditionally, this setback could be accomplished with a BAS receiving occupancy signals from sensors distributed throughout the building, which may be efficiently provided by a lighting control system using the sensors for automatic lighting shutoff. Upon receiving a vacancy signal, occupied-standby mode can be accurately triggered. In this mode, the HVAC system reduces airflow and stretches temperature setpoints in unoccupied zones, which reduces HVAC energy consumption.

Networked lighting control

A path to lighting-BAS integration is a networked lighting control (NLC) system, which may be visualized as communication layers starting with LED drivers and building up to a network. Integration resides atop this architecture. At this added layer, building systems can be integrated with each other or cloud-based applications, typically using wired ethernet cabling or wireless communication.

Once communication is established, integration becomes actionable through the BAS software. The NLC system’s primary goal in this strategy is to supply occupancy signals through its architecture to the BAS.

This can be quite sophisticated, requiring coordination between disciplines. The opportunity is generally best suited to larger projects with an NLC system, BAS and a variable-air volume HVAC system in which HVAC and lighting control zones align, as indicated in the NLC-HVAC Integration Toolkit published by the DesignLights Consortium in 2025. Project teams can use this series of free tools and guidance resources to implement integration.

Bluetooth NLC 

The introduction of Bluetooth NLC smart thermostats promises to change the integration game by providing a new alternative to using a BAS. Launched in September 2023 by the Bluetooth Special Interest Group (SIG), Bluetooth NLC is an open full-stack standard that layers onto previous Bluetooth wireless lighting standards to promise multivendor interoperability across NLC systems. In July 2025, Bluetooth SIG formally approved the HVAC Integration NLC Profile, encouraging manufacturers to design compliant products.

As a result, Bluetooth NLC smart thermostats can replace wired thermostats, either within a Bluetooth NLC system or working with standalone mesh-network sensors. These thermostats can combine temperature control, occupancy intelligence, analytics and connectivity in a single device. 

By being interoperable with Bluetooth NLC sensors, they can receive occupancy signals directly from the sensors and adjust temperature setpoints for specific HVAC zones, bypassing the need for a BAS. If the space contains multiple sensors, such as luminaire-level lighting controls, the smart thermostat can apply advanced logic and fusion algorithms to evaluate occupancy data from every luminaire in the zone, determine a real-time percentage of occupancy and automatically select an appropriate setback.

Besides the promise of a more direct path to integration, removing the BAS as a requirement produces two major benefits. First, any building with Bluetooth NLC sensors installed may be considered a highly suitable candidate for evaluation for installing Bluetooth NLC smart thermostats for significant add-on energy savings potential. Second, it opens the door to lighting-HVAC integration in small and medium-sized commercial buildings unlikely to have a BAS.

As this is a relatively new development in the industry, products are now being introduced. One of the first manufacturers to put out a Bluetooth NLC thermostat was mwConnect, Sacramento, Calif., and technology partner Silvair, San Francisco, which partnered with Network Thermostat, Grapevine, Texas. The product is now available on mwConnect’s TruBlu platform and some other wireless ecosystems.

“This could honestly be the most exciting development to come along in the last 10–15 years,” said Stephen Zhou, executive vice president of mwConnect. “Simplified lighting-HVAC integration has been pursued for decades, and this approach promises simplicity, reasonable first cost of investment and scalability. We’re very excited about the potential.”

Despite substantial energy savings, lighting-­HVAC integration has lagged in adoption largely due to project complexity. The Bluetooth HVAC Integration NLC Profile may be a solution that simplifies one key aspect of integration, expanding applications and extending the value of networked lighting control to justify its installation.

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