Top 71 Energy-efficient Building startups

Updated: Dec 25, 2025
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These startup develop smart HVAC, lighting systems, energy storages, solar roofs, energy management systems, sustainable building materials and other technologies for energy-efficient buildings.
1
Redaptive
Country: USA | Funding: $1.7B
Redaptive is an Energy-as-a-Service provider that funds and installs energy-saving and energy-generating equipment and manages energy use in buildings.
2
BlocPower
Country: USA | Funding: $266.6M
BlocPower is offering smart, all electric heating, cooling, and hot water systems to building owners for no money down.
3
Urban Volt
Country: Ireland | Funding: €224M
Urban Volt is an energy-saving LED lighting firm. They retrofit commercial premises with LED lighting for no upfront cost. Their unique Light as a Service business model allows our clients to enjoy cash and energy savings from the moment of installation.
4
Atom Power
Country: USA | Funding: $174.5M
Atom Power built the world’s first and only true solid-state circuit breaker. Using semiconductors to control the current digitally, this breakthrough unlocks a future where power is smartly controlled and exponentially safer.
5
Ice Energy
Country: USA | Funding: $132M
Ice Energy develops Ice Bear - thermal energy storage for air conditioning, that is lowering electric bills for businesses and homeowners, and reducing CO2 emissions.
6
Aeroseal
Country: USA | Funding: $119M
Aeroseal seals both air ducts and building envelopes so you waste less energy and reduce your bill
7
David Energy
Country: USA | Funding: $100.5M
David Energy looks to transform every building into an energy retailer that helps customers get more value out of their solar and storage systems.
8
Solatube International
Country: USA | Funding: $100М
Solatube developed the system that revolutionized the way daylight was brought into a building. Known as a tubular daylighting device (TDD), this product was a compact and leakproof alternative to traditional skylights.
9
Broad Group
Country: China
Broad Group produces clean air-conditioning systems and other sustainability-oriented products to enhance building efficiency. The company uses a patented, non-electric air chiller in its air conditioning design. Instead of using Freon (the traditionally used chiller), the system taps into natural gas to produce a solution that ultimately cools the air.
10
ecoworks
Country: Germany | Funding: €78.9M
ecoworks uses industrial prefabrication, digital processes, and energy systems to modernise multi-family houses with up to four floors within a few weeks. During the renovation process, the building is converted into “a small, decentralised power plant” by installing photovoltaic systems, heat pumps and thermal reservoirs.
11
Ubiquitous Energy
Country: USA | Funding: $75M
Ubiquitous Energy is developing a special kind of “solar glass” designed to convert sunlight into electricity, minus the traditional photovoltaic panels.
12
75F
Country: USA | Funding: $74.9M
75F is a predictive and proactive IoT-based building automation system that addresses HVAC, lighting, and equipment control needs.
13
BrainBox AI
Country: Canada | Funding: $75.1M
BrainBox AI utilizes cloud-based computing, algorithms, and a proprietary process to create an autonomous building technology.
14
Carbon Lighthouse
Country: USA | Funding: $67.1M
Carbon Lighthouse is on a mission to stop climate change by making it easy and profitable for building owners to eliminate carbon emissions caused by wasted energy. The company’s unique approach to Efficiency Production goes deep into buildings to uncover and continuously correct hidden inefficiencies that add up to meaningful financial value and carbon elimination that lasts.
15
Verdigris Technologies
Country: USA | Funding: $51.5M
Verdigris Technologies is a SaaS-based platform that develops artificial intelligence in order to optimize energy consumption.
16
Qarnot
Country: France | Funding: €48M
Qarnot designs and develops Q.rad, a computing heater embedding microprocessors as a heat source and connected to the Internet.
17
Kontrol Energy
Country: Canada | Funding: $50M
Kontrol Integrates smart energy devices, energy software and energy retrofits to help organizations benefit from energy cost savings while minimizing greenhouse gas emissions.
18
Worlds
Country: USA | Funding: $40.7M
Worlds' technology combines deep learning and IoT inside of a 4D environment to give organizations the ability to observe their organization’s physical space and then, analyze and learn from their physical surroundings
19
Blue Frontier
Country: USA | Funding: $38.1M
Blue Frontier specializes in air conditioning systems designed for sustainability, comfort and energy storage. It's technology is based on liquid desiccants, which dehumidifies air.
20
Covetool
Country: USA | Funding: $36.8M
Covetool is a B2B SaaS company that helps make buildings energy efficient while saving on construction cost.
Alexander Gillet
Editor: Alexander Gillet
Alexander Gillet is a senior editor for EnergyStartups. He has a deep background in energy sector and startups. Alexander graduated from Emlyon Business School, a leading French business school specialized in entrepreneurship. He has helped several non-profit organizations dedicated to promoting environmental education and sustainability and has written over 250 articles on energy technology for various websites. In his free time, Alexander enjoys yoga, camping and exploring the Blue Ridge Mountains. You can contact Alexander at alexgillet(at)energystartups(dot)com