Best Energy Efficiency Tech Companies in Boston, United States
The 41 best Energy Efficiency Tech companies in Boston, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Enel X.
Our analysis of 50 Energy Efficiency Tech companies
$7.8b in tracked funding; 86% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy Efficiency Tech companies in Boston
| # | Company | Disclosed funding | Last round | Stage | Employees | Founded | Founder | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Enel X Developer of utility-scale renewable energy projects | $168M | 68 mo ago | Acquired | 513 | 2001 | — | — | — |
| 2 | Lucidity Lights Contract based manufacturer of lights | $95M | 55 mo ago | Series D | 31 | 2012 | John Goscha Founder | 68 patents Patents concentrated in electrical & electronics | — |
| 3 | Voltus Provider of demand response solutions for industrial and commercial applications | $66M | 63 mo ago | Series C | 172 172 → 286 (+66%) | 2016 | Dana Guernsey Co-Founder & CEO | — | — |
| 4 | Digital Lumens Intelligent LED based lighting solutions | $61M | 142 mo ago | Acquired | 50 50 → 42 (-16%) | 2008 | — | 154 patents Smart, network‑controlled modular lighting systems with adaptive illumination and mesh routing optimization | 1 partnership |
| 5 | enVerid Provider of energy-saving HVAC solutions for heating, ventilating, and air conditioning systems | $49M | 39 mo ago | Series B | 31 | 2010 | Christian Weeks Chief Executive Officer | — | — |
| 6 | WindESCo Provider of IoT-enabled sensor solutions for wind turbines | $26M | 37 mo ago | Series B | 17 17 → 10 (-41%) | 2012 | — | 24 patents Coordinated yaw control systems optimizing wind turbine alignment for farm-wide efficiency | — |
| 7 | Essess Energy efficiency software & services | $11M | 141 mo ago | Deadpooled | — | 2011 | Thomas Scaramellino President & CEO | 4 patents Non-destructive structural health monitoring using thermal imaging and analysis algorithms. | — |
| 8 | Tetra Provider of air conditioning, boiler & furnace replacement and HVAC installation services | $10M | 32 mo ago | Seed | 23 | 2021 | Max Veggeberg CEO | 55 patents Pet nutrition and health formulations, including palatable pet foods and antifungal treatments | — |
| 9 | Ecovent Systems Wirelessly control room heating vents | $10M | 131 mo ago | Acquired | 15 | 2012 | — | — | — |
| 10 | Pascal Manufacturer of solid refrigerants for HVAC systems | $8M | 27 mo ago | Seed | 6 | 2023 | Adam Slavney Co-Founder & CEO | 10 patents Electronic vaping devices and safety caps for liquid containers | — |
| 11 | Retroficiency SaaS-driven data analytics for C&I customers | $7M | 162 mo ago | Acquired | 40 | 2009 | Bennett Fisher Ex-CEO & Co-Founder | 4 patents Virtual building energy performance assessment and optimization using digital twin modeling | — |
| 12 | Altus Thermal Provider of residential water heating and cooling solutions | $7M | 32 mo ago | Series A | 7 | 2019 | Michael Rigney CEO & Cofounder | 6 patents Smart control algorithms for electric resistance and heat‑pump water heaters | — |
| 13 | MyEnergy Provider of solutions to help consumers to switch electricity suppliers | $6M | 187 mo ago | Acqui-Hired | 200 | 2007 | Ben Bixby CEO | — | — |
| 14 | Propexo Ofers a unified API for integration leading property management systems 55Talent top 35%Funding top 45%Global bottom 25% All 3 signals ▾Talenttop 35% Fundingtop 45% Globalbottom 25% Talent: 3 named leaders on record Funding: Raised $5.0M across 1 rounds · 1 rounds over 1 yrs (1.0/yr) rank vs industry peers · Fliar Intelligence Index 55/100 | $5M | 11 mo ago | Series A | — | 2022 | Remen Okoruwa Co-Founder & CEO | — | 1 launch |
| 15 | wegowise WegoWise is a web-based utility analytics platform that integrates big data with energy efficiency for the… | $5M | 159 mo ago | Acquired | 50 | 2010 | — | — | — |
| 16 | Energy Points Marketplace for premium domain names, offering secure transactions and brand alignment | $4M | 144 mo ago | Deadpooled | 11 | 2011 | Ory Zik Founder | — | — |
| 17 | Embue Provider of a cloud-based platform for building maintenance management | $4M | 45 mo ago | Seed | 18 | 2007 | — | — | — |
| 18 | Off Grid Box Off-grid power solution developer using solar energy | $2M | 96 mo ago | Seed | 14 | 2013 | — | — | — |
| 19 | NEMOmetrics Provider of energy monitoring, equipment diagnostics, and indoor location technology | $2M | 203 mo ago | Funding Raised | — | 1998 | Elmer Lupton CEO | — | — |
| 20 | Vecarius Provider of heat recovery solutions for energy management systems | $968K | 155 mo ago | Funding Raised | 3 | 2009 | Steve Casey President & CEO | 14 patents Thermoelectric modules for waste‑heat recovery and solid‑state cooling applications. | — |
| 21 | Aerogel Technologies Develop and manufacture monolithic aerogel materials | $225K | 74 mo ago | Funding Raised | 9 | 2004 | — | 12 patents Manufacturing porous polymer and silica aerogel structures for lightweight insulation and filtration | — |
Top 12 Energy Efficiency Tech companies in Boston
#1
Series A · Boston, Massachusetts · founded 2022$5Mraised▾
Ofers a unified API for integration leading property management systems. The platform enables users to manage time and revenue. It helps in managing customers through its property managing features.
- Sep 2025Series A$5M
#2
Series B · Boston, Massachusetts · founded 2010 · 31 employees$48.9Mraised▾
Provider of energy-saving HVAC solutions for heating, ventilating, and air conditioning systems. It offers(HLR) HVAC Load Reduction, a family of retrofit modules that remove carbon dioxide, volatile organic compounds, and other trace contaminants. The HLR solution minimizes the amount of outside air required to maintain indoor air quality, reducing the load on the HVAC system and resulting in significant energy savings.
- May 2023Series B$13.9M
- Nov 2020Grant (prize money)—
- Mar 2020Series B$20M
- Mar 2016Series B$10M
#3
Series B · Boston, Massachusetts · founded 2012 · 17 employees$26.4Mraised▾
Provider of IoT-enabled sensor solutions for wind turbines. It uses smart sensors, optimization algorithms, M2M communication, and IoT cloud computing to make the turbine more efficient. It has developed a platform that analyzes how wind farm operators measure and utilize the wind to maximize performance while protecting major components from damage.
- Jul 2023Series B$9M
- Feb 2022Series B$4M
- Apr 2020Series B$10M
- Feb 2020Series A$5.3M
#4
Seed · Boston, Massachusetts · founded 2023 · 6 employees$8Mraised▾
Manufacturer of solid refrigerants for HVAC systems. The technology aims to transform HVAC systems and make cooling and heating more sustainable.
- May 2024Seed$8M
#5
Acquired · Boston, Massachusetts · founded 2001 · 513 employees$168Mraised▾
Developer of utility-scale renewable energy projects
- Jan 2021Grant (prize money)$279K
- Sep 2020Grant (prize money)—
- Feb 2020Grant (prize money)$1M
- Jun 2019Grant (prize money)$418.7K
#6
Series D · Boston, Massachusetts · founded 2012 · 31 employees$95.3Mraised▾
Contract based manufacturer of lights
- Jan 2022Series D$365K
- Mar 2018Series D$43.6M
- Jan 2017Series C$15.2M
- Mar 2014Series B$27.6M
#7
Seed · Boston, Massachusetts · founded 2021 · 23 employees$10.5Mraised▾
Provider of air conditioning, boiler & furnace replacement and HVAC installation services
- Dec 2023Seed$10.5M
#8
Series A · Boston, Massachusetts · founded 2019 · 7 employees$6.6Mraised▾
Provider of residential water heating and cooling solutions. It provides solutions for maximizing performance and for better integration with intermittent renewables and other distributed energy resources, enabling residents to efficiently and cost-effectively electrify their homes.
- Dec 2023Series A$5.3M
- Oct 2022Seed$550K
- Apr 2022Seed$772.5K
- 2021Seed—
#9
Series C · Boston, Massachusetts · founded 2016 · 172 employees$66.2Mraised▾
Provider of demand response solutions for industrial and commercial applications. It has the capability to reduce energy costs by managing participation in demand response programs. It installs Voltlet on each site which provides real-time energy visibility and control and predicts peak demands of the electric grid when costs of electrical energy are higher and manages the demand response accordingly.
- May 2021Series C$31.1M
- Oct 2020Series B$25M
- Nov 2017Series A$10.1M
#10
Acquired · Boston, Massachusetts · founded 2008 · 50 employees$60.6Mraised▾
Digital Lumens provides high efficiency industrial grade LED lighting along with cloud and onsite management software and terminals. Their Lightrules software provides cloud based control, metering, analytics and scheduling of all of their lighting fixtures. Their High Bay intelligent fixtures provide features such as: occupancy sensing, daylight sensing, power metering and onboard intelligence to maximize efficiency along with integration with their cloud services. They also offer Digital Light Agents (DLAs) which make all fixtures compatible with their cloud based device management software
- Oct 2014Series C$23M
- Jan 2013Series B$10M
- Apr 2011Series B$10M
- Dec 2009Series A$5M
#11
Seed · Boston, Massachusetts · founded 2007 · 18 employees$4Mraised▾
Provider of a cloud-based platform for building maintenance management. The company's platform delivers building automation and analytics with a portfolio-wide dashboard and in-building network of smart devices to owners and managers of large apartment buildings, enabling them to receive alerts and remote control devices from anywhere and anytime.
- Nov 2022Seed$2.3M
- Oct 2013Seed$250K
- May 2013Seed$150K
- Aug 2010Seed$1.2M
#12
Acquired · Boston, Massachusetts · founded 2012 · 15 employees$9.9Mraised▾
ecoVent makes a smart, wireless, HVAC zoning system that allows room by room temperature control in the home. ecoVent tackles the problem of heating/cooling rooms which are not being used, by redirecting airflow to where it’s actually needed. Its wireless vents are open or close based on the real temperature and humidity conditions of each room. Built-in motion sensors recognise when the room is empty, so there’s no need to heat or cool empty rooms.
- Sep 2015Series A$7.1M
- Oct 2014Seed$2.8M
- May 2014Venture Debt$605K
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy Efficiency Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Energy Efficiency & Buildings is moving in the United States
A read on the academic research around Energy Efficiency & Buildings — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 2,722 United States-affiliated papers.
- Purdue University West Lafayette140
- Oak Ridge National Laboratory127
- National Laboratory of the Rockies80
- Georgia Institute of Technology53
- Electric Power Research Institute53
- Radiative cooling1→50
- Passive cooling7→42
- Emissivity1→26
- Renewable energy14→38
- Thermal6→27
- Radiative cooling10→39
- Renewable energy63→89
- Energy storage22→48
- Photovoltaic system35→53
- Thermal35→53
- Renewable energy7→17
- Electricity2→9
- Heat pump40→47
- Energy management14→18
- Microgrid2→6
Where energy efficiency is researched across United States
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Who's filing energy efficiency patents in the United States
United States energy efficiency patent filing is accelerating — 3,337 filings from 1,859 assignees (2016–2025), led by Carrier, Intel, Rheem MFG; annual filings 315→449.
- Carrier430
- Intel178
- Rheem MFG177
- General Electric172
- Johnson Controls TECH123
- Haier US Appliance Solutions108
- FORD Global TECH108
- Lennox IND79
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.