Smart thermostat maker Boldr raises €4.2 million to grow connected heating and cooling platform

London-based smart climate technology startup Boldr has secured €4.2 million ($5 million) in a pre-Series A funding round to expand its platform across North America and develop software for contractors. The investment was led by Unconventional Ventures, with participation from several other venture capital firms and financial institutions.

Boldr's CEO and co-founder, Madi Ablyazov, emphasized the importance of working with contractors who install, maintain, and replace heating and cooling equipment inside homes to achieve a future where millions of homes work together to manage energy consumption.

This funding comes amid continued investment in 2026 in European technologies for building energy management, heating and cooling, and grid flexibility. Other notable European rounds in 2026 include €21 million for Axle Energy, €10 million for GALVANY, €7.8 million for Companion.energy, €40 million for metiundo, €11 million for Capalo AI, and over €15 million for Copenhagen's Hybrid Greentech, Munich's Entrix, and Cambridge's Barocal.

Boldr's approach involves building technology that connects equipment inside homes and other buildings, initially focusing on HVAC systems. The company sees HVAC contractors as critical partners in the electrification of homes. By providing contractors with tools to manage installed systems and offering real-time telemetry on equipment performance, Boldr aims to become a key player in residential energy management.