Boldr enables households to run heat pumps and air conditioning more intelligently, shifting heating and cooling in response to prices, comfort needs and grid constraints rather than just “on or off.” The London-based climate and energy tech startup has raised EUR 5 million in funding, recently announced.
The round brought together a notably mixed cap table: Unconventional Ventures, Ada Ventures, Tetrad Ventures, Davidovs Venture Collective, Roxbury Asset Management, Inclimo Climate Tech Fund, Prosegur, Techstars, S20 Fund and PropelX.
A slightly contrarian bet: software around heat pumps, not heat pumps
Boldr’s timing reads as against-trend relative to the last two years of European heat pump sentiment. Heat pump sales in several major European markets fell sharply in 2024 amid falling gas prices, high interest rates and policy uncertainty, with recovery only starting in 2025 and continuing into 2026. In that context, backing a company adjacent to heat pump adoption can look like a second-order trade.
But Boldr is not a hardware manufacturer exposed to factory utilisation and installer bottlenecks. Its pitch is a home energy management (HEM) platform that uses smart thermostats and virtual power plant (VPP) concepts. Its flagship product, Klima, is described as turning heat pumps and AC units into smart devices.
The contrarian angle is that the “heat pump cycle” is messy, but the need to operate electrified homes flexibly is not. Put differently: if customers are nervous about buying new kit, they may still be willing to pay for better control of the kit they already have.
Why this investor mix matters
The round combines climate venture brands with a broader set of backers, including corporate participation (Prosegur) and Techstars, suggesting Boldr is being positioned for distribution and deployment, not just product iteration.
It also continues a pattern of multi-party backing. Boldr previously raised in 2023 with investors including Ada Ventures and Techstars, alongside other funds and angels, indicating it has been building support across several ecosystems rather than relying on a single lead driving follow-on capital.
Market context: HEM is growing even when specific devices wobble
Boldr is entering a category that has been quietly compounding. European market analysis of home energy management indicated around 800,000 new HEM systems were installed in 2023, with the continent’s installed base exceeding 2.4 million. A separate 2024 outlook suggested the market could roughly double by 2030.
That matters because HEM is increasingly a “control layer” that can span multiple devices, including heat pumps, AC, EV chargers and home batteries. For startups, that can be a more resilient wedge than betting exclusively on a single appliance’s sales curve.
Bottlenecks Boldr still has to work around
Even if Boldr is “software-first,” deployment is not frictionless:
- Device compatibility and integration depth: Turning heat pumps and AC into responsive assets requires stable integrations across brands and installer configurations. The long tail of HVAC equipment can turn integration into an operational slog.
- Installer and channel partnerships: For connected heating and cooling to scale, the product needs to be sold and installed through trusted partners. The best UX in the app does not fix a weak installer network.
- Customer acquisition economics: HEM can struggle with payback clarity. If Boldr is selling comfort, savings and grid services, the key question is which of those pays the bills first.
- Regulatory and market access for flexibility revenue: The European Commission has pointed to new financing instruments and the Social Climate Fund to support heat pump rollout across EU countries. Helpful, but the monetisation path for household flexibility still depends on local market rules, aggregators and metering realities.
What to watch next
This EUR 5 million round looks designed to push Boldr from “promising controls product” into “repeatable deployment machine.” The core test is whether Boldr can secure distribution and prove measurable outcomes (bill savings, comfort stability, peak shifting) at scale, in a market where consumers are price-sensitive and installers are busy.
If Boldr can become the default control layer for connected HVAC, it benefits from electrification regardless of whether heat pump unit sales are sprinting or jogging.
What would make this work
- Clear distribution via installers, OEM partnerships or energy retailers, with low-friction onboarding
- Demonstrated savings and comfort outcomes that are easy to explain and verify
- Broad HVAC compatibility with reliable integrations across the main European brands
- A credible route to flexibility revenues through VPP partnerships and local market access
What could break it
- Integration complexity and support costs ballooning as device coverage expands
- Customer acquisition costs outpacing willingness to pay for “smart” features
- Policy and market-rule fragmentation limiting monetisation of household flexibility
- Installer channels prioritising hardware margin over third-party control platforms