40% of the Climate Problem Lives in Buildings That Already Exist
June 9, 2026
40% of the Climate Problem Lives in Buildings That Already Exist
Why the most important decarbonisation opportunity isn’t where everyone’s looking — and what that means for anyone making infrastructure decisions today.
Buildings are responsible for roughly 40% of global energy consumption and, according to UN and IEA estimates, around a third of the world’s CO₂ emissions. Of that share, HVAC systems — heating, ventilation, and air conditioning — account for between 40% and 60% of total energy consumption in a typical building.
That makes climate control the centre of a decarbonisation problem the technical market is already discussing, but that the general public still hasn’t connected to its own infrastructure decisions.
The conversation stays on electric vehicles, solar panels, green hydrogen. Meanwhile, in the sector itself, 2025 delivered several quiet milestones at once: in the US, heat pumps matched conventional air conditioners in sales for the first time. In Germany, they overtook gas heating systems for the first time in the first half of the year. In the UK, sales rose 27% to a record 125,000 units. Different markets, same direction — the clearest signal yet that the transition is already underway.
But there’s a conversation none of those figures capture: not who manufactures the right equipment, but who makes the right decision about how to integrate it. And that conversation remains technical, concentrated among a few, and structurally absent from the rooms where renovation budgets get decided.
Three converging forces:
- Regulation: The EU’s revised EPBD directive, adopted in April 2024, the UK’s Net Zero targets, and efficiency codes in California and New York, forcing movement against hard deadlines.
- Technology: IoT sensors, digital twins, predictive control — matured to the point where the promise of a decade ago is now implementable at reasonable cost.
- Economics: The cost of heat pumps and smart controls falling sharply, turning renovation into an investment with a 7-10 year positive return in many markets, with no subsidy required.
A mature technical solution, regulatory pressure with real deadlines, and economics that work. That convergence doesn’t happen often — and when it does, the cost of arriving late is exponentially higher than the cost of arriving first.
But arriving first isn’t an individual decision. It’s an ecosystem decision: manufacturers, financiers, installers, and regulators, all aligned in the same direction. The programmes built to catalyse that alignment aren’t looking for more technology. They’re looking for judgement.
Between 65% and 80% of the buildings that will exist in 2050 are already built today. Decarbonising this sector isn’t a new-design problem — it’s a retrofit problem. And retrofitting existing buildings is infinitely more complex: there’s no blank page. There are ageing systems, regulations that have evolved, occupants who can’t be displaced, and owners with wildly different investment horizons.
The moral storm of the rented building
There’s a structural problem in this market that no technology solves on its own.
Whoever pays the energy bill is frequently not whoever makes the investment decision on efficiency. The tenant pays for energy. The landlord decides whether to renovate the HVAC system. The developer who built the building 20 years ago carries no responsibility for what it consumes today. And the tenant receiving the bill often has no way of knowing what percentage of what they’re paying is the direct consequence of a system designed for an energy world that no longer exists.
The technical solution exists. The economics work. But the incentive system is broken — and that isn’t a technology problem. It’s a design problem.
The system keeps consuming exactly what it always consumed. Until regulation forces the issue, or until someone in the room understands the whole system and designs the solution that aligns the incentives. That person doesn’t need another salesperson. They need a translator who speaks three languages at once: technical, financial, and regulatory.
The owner of a commercial building doesn’t wake up thinking about decarbonisation. They wake up thinking about:
- The energy bill: Double-digit percentage increases, with commercial electricity rates rising 13-29% in a single year across several US markets recently.
- Regulatory deadlines: The EU’s revised EPBD roadmap for 2027 requiring binding whole-life carbon limits.
- Operational failures: Systems failing during peak seasonal periods causing weeks of partial operation.
- Tenant satisfaction: Thermal comfort complaints in systems that won’t respond appropriately.
Those are the visible symptoms. The problem underneath is simpler, and more expensive: a system designed for an energy world that no longer exists, operating inside a building that regulation is about to touch — with a date, a fine, and no room for negotiation.
What that owner needs isn’t someone to sell them the right equipment. It’s someone who can translate what those symptoms mean for their P&L, and what it’s costing them every month that the conversation doesn’t happen.
The system inside the system
Nature solved this problem long before we did. The human body doesn’t generate heat or cold separately for each part that needs it. It has a circulatory system that redistributes what it already has: it sends more blood to the skin when heat needs to be released, and holds it closer to the core when heat needs to be conserved.
That is exactly what the most advanced HVAC systems do today: instead of generating new energy for every requirement, they reuse the heat the building already produces — servers, people, equipment — and route it where it’s needed, anticipating rather than reacting.
The traditional system generates and dumps. The well-designed system redistributes and anticipates.
What the equipment can’t fix
And the data confirms something counterintuitive: most efficiency losses in HVAC don’t come from the equipment itself, but from how it’s configured — sensors placed incorrectly, generic control logic that was never tuned to the actual building. Configuring an existing system properly can cut consumption by 10% to 25% without changing a single unit.
There’s more. The newest, most efficient heat pumps often perform worse in real life than in the lab, because installation and configuration weren’t adjusted to the specific building. A great unit badly installed can perform worse than a modest unit well installed.
Which is why the question is never only “what equipment should we buy”. It’s “who understands the whole building well enough to make that equipment perform the way it should”.
According to the IEA, global energy efficiency progress has consistently run at roughly half the pace needed to stay on track for net zero by 2050 in recent years. Technology is advancing. Regulation is applying pressure. And the market is moving at roughly half the speed it needs to. That gap doesn’t close with more technology. It closes with better decisions.
The most expensive retrofit
How many of your buildings are running HVAC systems designed for a world that no longer exists? What is that costing you every month it doesn’t change? And who on your team is actually designing the conditions for that cost to disappear?
The most expensive retrofit isn’t the one that invests in thinking the problem through properly. It’s the one that saves that thinking today — and has to pay for the full renovation all over again five years later.
Sources & References
- UN Environment Programme / IEA — Buildings account for ~40% of global energy consumption and ~33-37% of energy-related CO₂ emissions.
- US DOE / ASHRAE — Industry-standard estimate for HVAC share of total building energy consumption.
- Canary Media — “Heat pumps may soon outsell air conditioners in US” (26 June 2026), citing AHRI data.
- E&M Powernews / energate messenger (2025) — Heat pumps overtook gas and oil heating sales in Germany, H1 2025.
- Heat Pump Association UK — 2025 annual sales report, 125,037 units (+27% YoY).
- European Commission — EPBD recast (Directive EU/2024/1275); UK Net Zero Strategy; California Title 24 / NY Local Law 97.
- EU Renovation Wave / Verdantix — 65-80% of 2050 building stock is already built today.
- Commercial Electricity Rate Reporting (2026) — US commercial rate increases up to 29% YoY; national rates up ~20%+ since 2018.
- Verdantix — “Europe’s Buildings Have 100 Days To Get Compliant” (March 2026).
- IEA Net Zero Roadmap — Global energy intensity improvement pace tracking below Net Zero by 2050 scenarios.