Top 25 HVAC startups

Updated: Dec 09, 2025
|
These startups develop energy-efficient Heating, Ventilation and Air Conditioning systems.
1
Helix Earth
Country: USA | Funding: $18.4M
Helix Earth is focused on rethinking how commercial HVAC systems manage temperature and humidity — a long-standing challenge for building owners facing rising energy costs, aging infrastructure and stricter performance expectations. At the core of the company’s approach is a novel system that separates temperature control from moisture management, allowing each to be optimized independently. Traditional air conditioning systems handle both simultaneously, often leading to inefficiencies, excess energy use and inconsistent indoor air quality. By decoupling these processes, Helix Earth aims to deliver lower energy bills, improved comfort and reduced wear on existing equipment.
2
Hometree
Country: UK | Funding: $468.9M
Hometree operates as an online-led boiler installation company.
3
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.
4
tado
Country: Germany | Funding: $250.1M
Tado° offers smart thermostats and apps that adjusts to the real-time behavior of residents in private homes and small businesses.
5
Phononic
Country: USA | Funding: $214.9M
Phononic innovates solid state semiconductor solutions that displace compressors, heat sinks and fans for cooling & heating
6
Dandelion Energy
Country: USA | Funding: $174.5M
Dandelion is an Alphabet spinout that develops geothermal heating, air-conditioning and cooling systems
7
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.
8
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.
9
BrainBox AI
Country: Canada | Funding: $75.1M
BrainBox AI utilizes cloud-based computing, algorithms, and a proprietary process to create an autonomous building technology.
10
Quilt
Country: USA | Funding: $62M
Quilt produces ductless, dual-zone home heat pumps controlled by artificial intelligence. Quilt's indoor and outdoor units, Dial and mobile app work together to create intelligent home climate control solution. To compete with established players in the heat pump market, the company has focused on software and design. One example is the over-the-air update it has implemented for existing heat pumps - the new firmware improved unit performance by over 20%. Ductless systems ensure a consistent temperature in every room. Quilt is even more efficient thanks to the Auto-Away feature, which uses smart sensors to save energy when rooms are unoccupied. Installation is simple and quick, like other ductless systems and most modern systems are currently in production. The company is building a network of certified installation partners.
11
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.
12
Exergyn
Country: Ireland | Funding: $36.9M
Exergyn is a clean-tech company that develops waste heat recovery and conversion technology.
13
PipeDreams
Country: USA | Funding: $35.7M
PipeDreams is the next gen, tech-powered home services provider.
14
Quatt
Country: Netherlands | Funding: €29.8M
Quatt designs AI-powered smart hybrid heat pumps to accelerate the decrease of gas consumption.
15
Bedrock Energy
Country: USA | Funding: $20.5M
Bedrock Energy develops drilling technology and advanced subsurface simulation software to enable geothermal heating and cooling.
16
Flair
Country: USA | Funding: $12.7M
Flair makes smart vents and wireless thermostats and advanced software for residential heating and cooling.
17
Harvest Thermal
Country: USA | Funding: $12.8M
Harvest Thermal develops a control system for home use that integrates heating, hot water, and cooling with thermal storage.
18
SkyCool Systems
Country: USA | Funding: $9.5M
Skycool Systems is improving the efficiency of all cooling systems by harnessing an untapped renewable resource. It's panels turn the sky into a renewable resource and reduce the electricity use of air conditioning and refrigeration systems
19
dPoint Technologies
Country: Canada | Funding: $6.1M
dPoint develops and sells membranes and energy recovery technology that significantly improve the energy efficiency and air quality in buildings. It has adapted its patented fuel-cell heat and humidity exchanger technology for use in energy recovery ventilator systems, which transfer heat and humidity between the intake and exhaust in a residential or commercial building’s ventilation system.
20
Conry Tech
Country: Australia | Funding: $3.5M
Conry Tech is reinventing air-conditioning to improve comfort and make it sustainable, founded by award winning HVAC experts.
21
Monodraught
Country: UK | Funding: £2.7M
Monodraught manufactures natural lighting, air conditioning and ventilation technology that is now widely used by the likes of IKEA, Ford and Waitrose.
22
Breezi.io
Country: USA | Funding: $1M
Breezi builds wireless devices that enable homeowners to detect problems with their HVAC systems before they become severe.
23
Kapacity.io
Country: Finland | Funding: $125K
Kapacity.io service connects remotely to buildings through building management systems to adjust HVAC energy consumption in real time using AI machine learning to optimize and find the best ways to consume electricity.
24
eCozy
Country: Germany | Funding: $806.3K
eCozy wants to eliminate the user's pain of setting up a digital thermostat, maintain comfortable and price-reasonable heating regimes. eCozy’s ergonomic shape & form makes it a long-lasting solution for years.
25
Hydronic Shell
Country: USA
Hydronic Shell Technologies provides HVAC and facade system to construction industry that enable energy retrofits.
  See also:
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