Startup list · Global
Building energy efficiency startups
Building energy efficiency startups ranked by Dealroom Signal. Company information and rankings are refreshed daily.
$3.9Bcombined funding · 50 companies
United Statestop hub
50companies shown
2unicorns
Current Dealroom classifications: Building Energy Efficiency. Company descriptions must also match the topic. Includes operational companies founded from 1990, with no recorded exit and an available Signal score. The highest scores rank first; funding is shown in USD.
Ranked by Dealroom Signal · Updated 2026-11-02 · Source: Dealroom
Related landscape: Building energy efficiency startups. This list uses current classifications and may differ from the original selection.
| # | Company | Founded | HQ | Signal | Funding |
|---|---|---|---|---|---|
| 1 |
 B
Base PowerUnicorn
Subscription home batteries that stabilize the grid and back up homes
|
2023 | Austin, United States | 97.26 | $2.3B |
| 2 |
 1
1KOMMA5°Unicorn
AI-powered home energy management and decarbonization solutions.
|
2021 | Hamburg, Germany | 96.03 | $1.0B |
| 3 |
 B
BOLDRFast growing
Contractor-first HVAC energy platform for flexible grid capacity
|
2022 | London, United Kingdom | 92.06 | $13M |
| 4 |
 K
Karman IndustriesFast growing
Modular, prefabricated industrial heat solutions reducing greenhouse emissions and costs with retrofittable technology
|
2024 | Signal Hill, United States | 91.63 | $32M |
| 5 |
 P
Performance Systems DevelopmentDealroom profile unavailable
Energy efficiency program, engineering services & software tools
|
1998 | Ithaca, United States | 91.31 | $1M |
| 6 |
 R
Rabot EnergyFast growing
Gives everyone an opportunity to make a contribution to the energy transition
|
2021 | Hamburg, Germany | 91.05 | $74M |
| 7 |
 R
ReonicFast growing
Digital platform for installers to plan, simulate, and manage solar, battery, EV charging, and heat pump projects
|
2021 | Augsburg, Germany | 90.89 | $14M |
| 8 |
 L
Lamarr.AIFast growing
Lamarr.AI uses drones, thermal imaging, and AI to revolutionize building diagnostics, offering faster, cheaper, and precise envelope retrofits
|
2021 | Atlanta, United States | 90.75 | $2M |
| 9 |
 B
Barocal
Solid-state barocaloric cooling without refrigerant gases
|
2019 | Cambridge, United Kingdom | 90.20 | $23M |
| 10 |
 E
ecop Technologies
High-temperature industrial rotation heat pump technology
|
2007 | Neuhofen an der Krems, Austria | 89.31 | $24M |
| 11 |
 A
Axle EnergyFast growing
A platform to connect EVs and home energy devices to electricity markets to help kick fossil fuels out of the grid
|
2023 | London, United Kingdom | 88.81 | $36M |
| 12 |
 A
AutarcFast growing
AI-powered operating system for residential energy installers
|
2023 | Berlin, Germany | 88.61 | $191K |
| 13 |
 A
Airex Technologies
Smart air brick for energy-efficient homes
|
2016 | London, United Kingdom | 88.33 | $10M |
| 14 |
 V
VamoFast growing
Making green, affordable heating with heat pumps
|
2022 | Cologne, Germany | 88.30 | $11M |
| 15 |
 A
aedifion
AI cloud platform for optimizing building energy efficiency
|
2017 | Cologne, Germany | 88.07 | $32M |
| 16 |
 G
Green FusionFast growing
With Green Fusion, you monitor, control, analyse and optimise your plant - easily, in real time and from anywhere
|
2021 | Hohen Neuendorf, Germany | 87.93 | $16M |
| 17 |
 L
LumoFast growing
Residential energy optimisation platform for home electrification
|
2023 | Cambridge, United Kingdom | 87.84 | $733K |
| 18 |
 O
OptimistFast growing
Air conditioners engineered for extreme heat, energy efficiency
|
2024 | New Delhi, India | 87.83 | $12M |
| 19 |
 H
hansethermFast growing
Enabling users to have climate-friendly heating in their homes, using heat pumps
|
2023 | Hamburg, Germany | 87.64 | $11M |
| 20 |
 D
Darcy Solutions
Darcy Solutions focuses on apatent-pending approach to ground source heat pumps, the most energy efficient and environmentally friendly heating & cooling technology
|
2018 | New Brighton, United States | 87.46 | $525K |
| 21 |
 Q
Quinn EnergyDealroom profile unavailable
Algorithmic electricity cost and consumption optimization
|
2025 | Zurich, Switzerland | 87.31 | — |
| 22 |
 V
VibooFast growing
Predictive Control as a Service (PCaaS) platform for manufacturers of building energy systems
|
2022 | Dübendorf, Switzerland | 86.49 | $6M |
| 23 |
 P
PropheticFast growing
Comprehensive real estate development software offering zoning maps, demographic trends, and environmental data for growth
|
2024 | Portland, United States | 86.20 | $3M |
| 24 |
 L
LuxWallFast growing
Provider of vacuum insulated glass (VIG) solutions designed to significantly reduce carbon emissions in the built environment
|
2020 | Ypsilanti Township, United States | 86.05 | $33M |
| 25 |
 C
CambioFast growing
Cambio's mission is to decarbonize the real estate industry and help businesses achieve their climate goals
|
2022 | New York City, United States | 85.99 | $18M |
| 26 |
 E
EnerdrapeFast growing
Enerdrape turns existing underground environments into renewable source of energy for the heating and cooling needs of buildings
|
2021 | Renens, Switzerland | 85.77 | $2M |
| 27 |
 C
cosy.green
Smart heating control for energy-efficient residential buildings
|
2023 | Langenselbold, Germany | 85.69 | — |
| 28 |
 I
InstallioFast growingDealroom profile unavailable
Tech-enabled installation-as-a-service for the UK's heat pump industry
|
2024 | London, United Kingdom | 85.51 | $2M |
| 29 |
 D
DeWarmteDealroom profile unavailable
The Heat Cycle recovers heat from all domestic wastewater
|
2019 | The Hague, Netherlands | 85.45 | — |
| 30 |
 T
TemelionFast growingDealroom profile unavailable
AI pre-construction engineering workflows
|
2025 | Les Ulis, France | 85.13 | $4M |
| 31 |
 X
Xempla
AI-agent platform that autonomously orchestrates building and asset maintenance to boost reliability and cut energy use
|
2018 | Melbourne, Australia | 85.06 | — |
| 32 |
 A
Arch
An HVAC sales software for home analysis & system design
|
2022 | San Francisco, United States | 83.94 | $6M |
| 33 |
 E
EntropicaDealroom profile unavailable
Reducing heating costs and carbon through flexibility-first heat pumps
|
2026 | Sheffield, United Kingdom | 83.91 | — |
| 34 |
 S
Spruce Eco
End-to-end software platform for heat pump installers
|
2023 | London, United Kingdom | 83.64 | $4M |
| 35 |
 C
Coral
Heat pump installers are driving the green energy transition
|
2023 | New York City, United States | 83.60 | $8M |
| 36 |
 E
eLstar Dynamics
A developer and provider of adaptive smart glass for a wide range of applications such as architecture, automotive and specialty markets
|
2019 | Eindhoven, Netherlands | 83.51 | $13M |
| 37 |
 U
Utonomy
Automated pressure optimization technology for gas networks.
|
2015 | Chilworth, United Kingdom | 83.48 | $12M |
| 38 |
 H
Heizma
Renewable energy system installations for Austrian homeowners
|
2024 | Vienna, Austria | 83.41 | $3M |
| 39 |
 M
Meter&ControlDealroom profile unavailable
Hardware and software solutions for smart energy management
|
2008 | Belgrade, Serbia | 83.25 | — |
| 40 |
 G
GreenerU
GreenerU engages in the design and implementation of campus sustainability and energy solutions for colleges and universities
|
2009 | Waltham, United States | 83.16 | $8M |
| 41 |
 P
PascalDealroom profile unavailable
Developing a novel class of solid refrigerants poised to transform the heating, ventilation, and air conditioning (HVAC) industry
|
2023 | Cambridge, United States | 82.95 | $17M |
| 42 |
 N
NxLiteDealroom profile unavailable
Nano-thin energy and solar control coatings, industry leading window thermal management
|
2015 | Canton, United States | 82.81 | $48M |
| 43 |
 P
Prefix Maintenance
AI-powered facilities maintenance for multi-location businesses.
|
2022 | New York City, United States | 82.59 | $9M |
| 44 |
 E
Enersee
Eneos provides insight in Energy, Water and Utility data through its data analytics products, easily integrable in your preferred platforms without any hardware!
|
2020 | City of Brussels, Belgium | 82.52 | $6M |
| 45 |
 T
Tetra
Tetra simplifies heating and cooling replacements with an online platform, saving homeowners time, money, and frustration
|
2021 | Boston, United States | 82.40 | $15M |
| 46 |
 E
Envola
Envola is improving air conditioners and heat pumps' efficiency. The Venticer HVAC system reduces cooling energy consumption by >50% and heating by >30%.
|
2019 | Ulm, Germany | 82.38 | $2M |
| 47 |
 B
BlueHeart Energy
Thermoacoustic engine for refrigerant-free residential heat pumps.
|
2016 | Alkmaar, Netherlands | 82.38 | $6M |
| 48 |
 E
Electric AirDealroom profile unavailable
A modern heat pump for your home with HEPA
|
2023 | Redwood City, United States | 82.15 | $125K |
| 49 |
 N
Next Energy Technologies
A cutting edge solar technology that transforms windows into energy producing assets with unsurpassed aesthetics, performance, and economics
|
1990 | Goleta, United States | 82.11 | $35M |
| 50 |
 C
Coolfy Clima
Rapid residential air conditioning installation solutions
|
2023 | Tres Cantos, Spain | 81.87 | $317K |
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