Boldr raises €4.2m to sell heating tech through US contractors
The London company will spend a pre-Series A round on North American expansion and software for the HVAC installers it treats as its route to market. Unconventional Ventures led.
Boldr has raised €4.2 million, or $5 million, in a pre-Series A round.
Unconventional Ventures led. Ada Ventures, Tetrad Ventures, Davidovs Venture Collective, Roxbury Asset Management, the Inclimo Climate Tech Fund, Prosegur, Techstars, the S20 Fund and PropelX all took part.
The round follows a €2.7 million ($3.2 million) seed in 2025, which the company describes as oversubscribed.
The money is earmarked for three things: pushing the company's climate technology across North America, building out its contractor software, and covering a wider range of residential and commercial heating and cooling equipment.
Boldr was founded in London in 2022 by Madi Ablyazov, Toma Paro and Matheus Marotzke. Ablyazov is chief executive.
The business does not chase homeowners directly. It sells through the HVAC contractors who already install, service and replace heating and cooling kit, on the argument that those networks are the fastest way to get connected hardware into buildings.
Its main product is the Universal Thermostat, a hardware-agnostic control system. A wireless control module talks to a subbase at the equipment end, so an installer does not have to run new thermostat wiring.
Boldr says that saves as much as €428, or $500, in labour costs per installation. That is the company's own figure.
Each installed unit sends telemetry back to Boldr's cloud platform, which lets contractors check equipment performance remotely rather than dispatching a technician to look. A separate diagnostics SaaS product for servicing and maintenance is still in development.
The longer-term pitch is grid flexibility: heating, cooling, batteries, EV chargers and solar joined into one network that can shift electricity consumption when the grid is under strain.
Distribution is the part that matters most for the North American plan. Boldr has nationwide US distribution deals with HVAC companies and supply houses including Daikin and Bosch-owned Source 1.
Boldr is raising into a busy field. European rounds in building energy management and grid flexibility this year include €21 million for fellow London company Axle Energy, €43 million for Munich's Entrix, €40 million for smart-metering firm metiundo and €10 million for Berlin heat-pump platform GALVANY.
The lesson for founders selling hardware into buildings is in the go-to-market, not the device. Boldr's investors are backing an installed base it does not own and a labour-saving claim measured in one afternoon's wages — which is the kind of number a contractor can check on the first job.
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