S1 EP20 | Holly Foster - Heat Geek

Key Learnings from Episode 20: Scaling Quality, Community and Technology with Holly Foster, Heat Geek

In Episode 20 of Beyond the Raise, Alex and Will speak with Holly Foster of Heat Geek about transforming the UK heat pump industry through better training, technology and a community built around high standards. From turning installer expertise into scalable systems to protecting culture through Series A growth, Holly explores why quality, learning and a willingness to question established ways of working are central to Heat Geek’s mission.

Combining Technology, Operations and Climate Impact

Holly’s career began in media and data, working on digital personalisation for Tesco before moving into strategy consulting and later joining Uber in Scandinavia.

While helping scale Uber’s operations across the Nordics, she found an opportunity to combine technology and operations with climate impact through projects including Uber Green.

After completing an MBA at INSEAD and moving into early-stage startups, Holly eventually joined Heat Geek, attracted by both its climate mission and the ambition of the team.

For Holly, heat pumps offer a particularly tangible form of climate action. Replacing a gas boiler changes how an individual home uses energy, creating an impact that can be seen directly rather than existing only at a theoretical or policy level.

Key Takeaways

• Holly’s background combines data, strategy, technology and operational scaling.

• Working on Uber Green helped connect her operational experience with climate impact.

• Heat Geek offered an opportunity to apply those skills to a tangible decarbonisation challenge.

• The ambition and culture of the team were important reasons for joining.

Heat Geek Began with a Desire to Do Things Better

Heat Geek’s origins lie in education rather than technology or marketplaces.

Founder Adam began working with heat pumps and wanted to learn how to install them to the highest possible standard. He found that the depth of training he was looking for simply did not exist.

Heat pumps require a different approach to heating a home, making installer knowledge particularly important. Adam began creating his own training before expanding into YouTube to make that knowledge more accessible.

One of Heat Geek’s defining decisions was requiring a 100% pass mark from installers completing its training. The aim was to ensure people had genuinely understood the principles rather than simply attended a course and received a certificate.

Key Takeaways

• Heat Geek originally emerged from a gap in high-quality heat pump training.

• The business was built around improving installation standards from the beginning.

• YouTube helped make technical knowledge more accessible to installers.

• Requiring a 100% pass mark reinforced the importance of genuine understanding and high standards.

Education Created a Community Around Quality

The training gradually created something bigger than an education platform.

Through YouTube and online groups, installers had somewhere to ask technical questions, share work and learn from other people facing similar challenges.

Holly explains that these spaces were deliberately designed to be positive and supportive. Rather than simply criticising somebody’s work, the focus was on helping installers understand what could be improved.

Heat Geek later developed a map of trained installers, allowing homeowners to find people who had completed the training.

That created a positive cycle where education supported quality, quality strengthened the community and membership of that community could generate commercial opportunities for installers.

Key Takeaways

• Education helped Heat Geek build a community before it built a marketplace.

• Online groups gave installers somewhere to share problems and learn from each other.

• A supportive culture differentiated the community from more critical online spaces.

• The installer map connected professional standards with real commercial opportunities.

Turning Installer Expertise into a Scalable System

Moving from community to marketplace required Heat Geek to translate years of practical installer knowledge into repeatable systems.

Much of that expertise existed as experience and rules of thumb developed through years on site. The technical challenge was turning it into something structured enough to work consistently across thousands of homes.

Heat Geek now uses technology to support this process, including its machine learning algorithm, Zero Disrupt.

Information collected during an expert home survey can be used to generate and assess large numbers of potential system designs. This allows work that would have required significant manual effort to become increasingly repeatable.

The objective is not to remove the installer. Instead, technology takes on tasks that can be standardised while experienced installers continue to provide the judgement and on-site knowledge they are best placed to deliver.

Key Takeaways

• Scaling required practical installer knowledge to be codified into repeatable processes.

• Technology can automate work that would be inefficient to complete manually for every home.

• Zero Disrupt uses survey information to assess potential heat pump designs.

• Heat Geek sees technology and installer expertise as complementary rather than competing.

Scaling Quality Takes Work Before It Creates Efficiency

The transition towards scalable systems has required significant investment.

Holly describes the process of taking something that might previously have required hours of manual work and spending considerably longer understanding, structuring and codifying it before it can eventually become repeatable.

Heat Geek has approached this gradually, moving appropriate parts of the installation journey into technology-supported processes while retaining the areas where installer expertise matters most.

Around the time of its Series A, Holly says the company reached the end-to-end journey it had envisaged around two years earlier.

That created a shift from building the minimum infrastructure needed to make the marketplace work towards adding more value for installers and customers.

Key Takeaways

• Automation often requires substantial upfront work before efficiencies appear.

• Heat Geek has gradually standardised parts of the installation journey rather than attempting to automate everything.

• Installer expertise remains the foundation underneath the technology.

• Reaching an end-to-end journey allowed the business to move from building infrastructure towards adding more value.

Series A Expanded What Heat Geek Could Aim For

Heat Geek had already benefited from experienced investors before its Series A, but the latest funding brought additional industry expertise and reach.

Holly highlights Carrier joining the cap table as particularly significant. As one of the world’s largest HVAC manufacturers, Carrier brings industry experience and a network that can open conversations and opportunities that would otherwise take considerably longer to develop.

The funding did not fundamentally change Heat Geek’s direction. Instead, it increased the scale of what the team believed it could achieve.

For Holly, one of the biggest shifts after Series A has therefore been the expectation to think bigger, wider and faster.

Key Takeaways

• Series A brought strategic value alongside additional capital.

• Carrier gives Heat Geek access to significant HVAC experience and networks.

• External investment validated a model the team had already spent years developing.

• The funding increased the scale and pace of Heat Geek’s ambitions rather than changing its core mission.

Operational Systems Need to Match the Stage of the Business

Holly’s role has evolved as Heat Geek has grown.

Earlier in the company’s development, her focus was on creating enough operational structure to support the business without introducing processes designed for an organisation many times its size.

Too much structure too early can slow a startup down. Too little can leave teams without the controls they need to operate effectively.

As Heat Geek has matured, Holly has increasingly focused on protecting what the company has built. That means looking further ahead at potential risks and using data, dashboards and KPIs to understand where improvements can be made.

More scale also creates more data, allowing the team to analyse increasingly small parts of the customer and operational journey.

Key Takeaways

• Early-stage businesses need enough structure to operate without becoming unnecessarily bureaucratic.

• Operational systems should evolve alongside the organisation.

• Holly’s role has shifted from building infrastructure towards protecting and improving it.

• Greater scale creates more data that can be used to identify increasingly detailed improvements.

Protecting Culture Means Being Prepared to Wait

Heat Geek has taken a deliberate approach to protecting its culture as the team grows.

The company assesses values alignment alongside technical ability and gives candidates practical work that reflects what their day-to-day role would actually involve.

Holly says the business would rather operate without somebody for longer than compromise by hiring a technically strong candidate who does not fit the culture.

That can be difficult when the team urgently needs additional capacity, but previous experience has shown how painful the wrong hire can become later.

The recruitment process has therefore become more structured as the company has grown, turning the founders’ instincts about culture into something that can be assessed more consistently.

Key Takeaways

• Heat Geek assesses values alignment as deliberately as technical capability.

• Practical tasks help both sides understand what working together would actually feel like.

• The business is prepared to leave roles open rather than compromise on cultural fit.

• Hiring processes have become more structured as the company has scaled.

Low Ego and Curiosity Matter at Heat Geek

When asked what makes somebody successful inside Heat Geek, Holly identifies low ego as one of the most important characteristics.

People also need to care deeply, although not necessarily about exactly the same thing. That might mean climate impact, their specialist area or improving conditions for installers.

Authenticity, creativity and a willingness to get involved are also important.

One of the company’s values is questioning the system. Employees are encouraged to challenge accepted ways of doing things and ask whether there might be a better approach.

That principle reflects Heat Geek’s origins, where the business itself began because its founders believed the existing way of training and supporting heat pump installers could be improved.

Key Takeaways

• Low ego is one of the strongest cultural traits Heat Geek looks for.

• Employees need to care deeply, even if their individual motivations differ.

• Authenticity, experimentation and personal ownership are valued.

• Questioning established systems remains central to how the company approaches innovation.

Making Heat Pumps a Normal Consumer Choice

For heat pumps to become truly mainstream, Holly believes consumers ultimately need to stop thinking about buying a particular technology and simply think about buying heat.

Trusted local installers will be important to that transition.

When a boiler fails, homeowners often turn to the heating engineer they already know. If that installer can offer a heat pump as a straightforward and competitive alternative, adoption becomes much easier.

There are still structural barriers. The relative price of electricity and gas affects running costs, while grid processes can add unnecessary complexity. Manufacturing and supply chains also need to continue scaling.

Installer capacity is another challenge. The industry needs more people with high-quality heat pump skills while also attracting a new generation into heating and installation careers.

Key Takeaways

• Heat pumps become mainstream when they feel like a normal heating choice rather than a specialist technology.

• Trusted local installers can play an important role in consumer adoption.

• Energy pricing and grid processes continue to affect the customer proposition.

• Expanding the pool of skilled installers will be essential as demand grows.

Regulation Should Focus More on Real-World Outcomes

Holly also questions whether current regulation always measures the things that matter most.

Heat pump installations involve substantial documentation and compliance requirements, but much of that assessment happens immediately after installation.

Holly argues that technology creates an opportunity to focus more closely on long-term performance.

Rather than relying primarily on paperwork showing that an installation met requirements on day one, digital monitoring could provide evidence of whether the system continues to operate efficiently over time.

That would shift the focus from proving that the correct process was followed towards understanding the actual outcome for the homeowner.

Key Takeaways

• Heat pump regulation currently places significant emphasis on installation processes and documentation.

• Digital systems create opportunities to monitor real-world performance over time.

• Long-term efficiency could provide a more meaningful measure of installation quality.

• Outcome-based regulation could better align compliance with the homeowner experience.

The Next Opportunity Could Extend Beyond the UK

Heat Geek’s ambition is increasingly international.

Holly believes the company has developed its model in a particularly challenging environment, with relatively high electricity prices and significant regulatory requirements.

Solving those problems in the UK could make expansion into markets with fewer barriers easier.

The long-term vision is not necessarily to build a dramatically larger organisation. Holly can imagine Heat Geek remaining relatively lean while its technology and systems enable it to operate across multiple markets and technologies.

Success would mean retaining the same culture and focus on quality while increasing the scale of the company’s climate impact.

Key Takeaways

• Heat Geek believes its UK experience could provide a foundation for international expansion.

• Solving problems in a difficult market may make the model easier to apply elsewhere.

• Growth does not necessarily have to mean dramatically increasing headcount.

• Technology and efficient processes could allow a relatively small team to create much greater impact.

Looking Ahead

Heat Geek’s ambition is to continue expanding the model it has developed around high-quality training, installer expertise and technology.

That means taking what has worked in the UK into new markets while continuing to improve the systems supporting installers and homeowners.

Holly’s vision is of a company that can electrify homes across multiple technologies and geographies without losing the culture or standards that helped build the business in the first place.

Rather than measuring success simply through headcount, the goal is to create systems capable of delivering much greater climate impact without requiring the organisation itself to grow at the same rate.

Final Thought

For Holly, some of the most valuable lessons have come from things going wrong.

An installation where multiple problems occurred and the customer lost confidence was painful at the time, but it forced the team to confront assumptions and change how it operated. Holly’s perspective is that non-existential failures experienced early can be valuable because they alter the trajectory of the business before the same problems happen at greater scale.

She also believes growing teams need to make time to step away from constant problem solving and recognise what they have achieved. In a fast-moving startup, those moments can feel difficult to justify, but they help people understand the progress they are making.

And small teams need to know when to bring in expertise they do not have internally. Whether the problem is highly technical or extremely niche, finding the right specialist can be far more effective than spending valuable time trying to learn everything from scratch.

The lesson is not to avoid difficult moments or knowledge gaps, but to use them to make the business better.