The Lennox E40 Smart Thermostat project focused on modernizing an established smart thermostat platform while preserving the reliability and functionality expected by homeowners and HVAC professionals. The objective was to deliver a next-generation user experience that simplifies installation, enhances whole-home comfort, and prepares the platform for the future of connected smart homes.

Built upon the successful design language introduced in the Lennox L40 and S40 platforms, the E40 combines an intuitive interface with advanced connectivity technologies, including Bluetooth® Low Energy (BLE), Matter, Smart Room Sensors, and Indoor Air Quality (IAQ) integration.

Modern smart thermostats are no longer simple temperature controllers — they have become the central hub for home comfort.

As the Lennox ecosystem expanded, the E40 platform needed to support:

• A redesigned user experience consistent with Lennox’s latest product family.
• Faster and simpler installation for homeowners and HVAC dealers.
• Wireless management of multiple Smart Room Sensors.
• Integration with Indoor Air Quality devices.
• Support for emerging smart-home standards.
• Compliance with evolving energy-efficiency regulations.

The challenge was to introduce these capabilities while maintaining compatibility with existing HVAC systems and delivering an intuitive experience for both first-time users and professional installers.

The project was developed through a close collaboration between Krasamo and Lennox Product Management and Engineering.

Building on the design principles Krasamo established for the Smart L40 and S40 platforms, the teams jointly refined the complete user experience for the E40 — balancing simplicity, accessibility, and advanced functionality. Krasamo led the frontend application experience, working closely with Lennox’s engineering teams to align interaction flows, onboarding, and system behavior across the connected product ecosystem.

Every screen, interaction, and installation flow was carefully refined to reduce complexity while supporting a growing network of connected devices.

Leveraging the design principles successfully established in the Smart L40 platform, the team redesigned the complete user experience for the E40, balancing simplicity, accessibility, and advanced functionality.

Every screen, interaction, and installation flow was carefully refined to reduce complexity while supporting a growing ecosystem of connected devices.

Modernized User Experience

The E40 adopted a refreshed interface inspired by the L40 and S40 product family, providing:

• Simplified navigation
• Faster access to common settings
• Improved touchscreen interactions
• Streamlined onboarding and installation flows
• Consistent visual language across Lennox Smart Thermostats

The result is an experience that feels modern while remaining familiar to existing Lennox customers.

Simplified Device Setup and Connectivity

A key focus of the experience was making wireless device setup feel simple and approachable.

Instead of relying on dealer-assisted configuration, homeowners can manage connected devices directly from the thermostat and mobile app — adding Smart Room Sensors, pairing wireless accessories, and completing setup with clearer guidance and fewer steps.

By removing installation barriers in the interface, the platform becomes significantly easier to deploy and maintain.

Smarter Whole-Home Comfort

Rather than relying on a single temperature measurement, the updated E40 experience helps homeowners take advantage of information from multiple Smart Room Sensors throughout the home — supporting a more balanced view of comfort across rooms.

By bringing together room temperatures, humidity, occupancy insights, and system conditions in a clearer interface, the thermostat helps deliver comfort that more closely reflects how occupants actually experience the indoor environment — supported by Lennox’s Feels Like™ technology.

Matter Integration

To prepare the platform for the future of the connected home, the E40 introduced support for the Matter smart-home standard.

Homeowners can now securely pair the thermostat with leading ecosystems, including:

• Apple Home
• Google Home
• Samsung SmartThings

Users can place the thermostat into discovery mode and complete pairing through their preferred smart-home application — reducing complex configuration steps and proprietary setup friction.

Ready for the Next Generation of HVAC Systems

The E40 platform was also enhanced to support the HVAC industry’s transition toward new energy-efficiency standards.

Through close collaboration with Lennox, the experience and application layer were aligned with the latest AHRI and U.S. Department of Energy (DOE) testing methodologies, ensuring compatibility with next-generation high-efficiency HVAC equipment and future performance metrics.

By preparing the thermostat for evolving industry requirements, the platform remains positioned for long-term innovation and regulatory compliance.

The redesigned E40 delivers measurable improvements across the entire homeowner experience:

• Faster first-time setup through Bluetooth onboarding.
• Self-service pairing of Smart Room Sensors without dealer intervention.
• Enhanced whole-home comfort through distributed temperature sensing.
• Simplified smart-home integration using Matter.
• A modernized interface consistent with the Lennox premium thermostat family.
• Future-ready architecture supporting connected devices and evolving HVAC standards.

The Lennox E40 Smart Thermostat demonstrates how thoughtful user experience design and close cross-company collaboration can transform a traditional thermostat into a connected home platform.

By combining an interface inspired by the L40 and S40 platforms with modern connectivity, intelligent comfort capabilities, and Matter interoperability, the E40 delivers a smarter, more intuitive experience for homeowners while reducing installation complexity for HVAC professionals.

The project reflects the successful partnership between Krasamo and Lennox — resulting in a thermostat experience designed not only for today’s connected homes, but also for the future of intelligent climate control.