Top 32 Energy-efficient cooling and air-conditioning startups

Updated: Dec 09, 2025
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Startups that develop smart air-conditioning systems for buildings and houses, industrial cooling systems and cold storages.
1
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.
2
Country: Israel | Funding: $347.7M
Nostromo Energy designed a water-based energy storage system that is challenging the current BTM energy storage landscape.
3
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
Country: USA | Funding: $214.9M
Phononic innovates solid state semiconductor solutions that displace compressors, heat sinks and fans for cooling & heating
5
Country: USA | Funding: $174.5M
Dandelion is an Alphabet spinout that develops geothermal heating, air-conditioning and cooling systems
6
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.
7
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
Country: USA | Funding: $97.5M
Sealed covers the upfront costs to install energy-saving upgrades like insulation, smart tech, and HVAC to make your house feel like new.
9
Country: Canada | Funding: $75.1M
BrainBox AI utilizes cloud-based computing, algorithms, and a proprietary process to create an autonomous building technology.
10
Country: Ireland | Funding: $36.9M
Exergyn is a clean-tech company that develops waste heat recovery and conversion technology.
11
Country: Ireland | Funding: $23.6M
HT Materials Science is developing a heat transfer fluid technology that acts as an additive for new or existing commercial and industrial cooling and heating systems. This technology reduces energy consumption
12
Country: USA | Funding: $20.5M
Bedrock Energy develops drilling technology and advanced subsurface simulation software to enable geothermal heating and cooling.
13
Country: Saudi Arabia | Funding: $17.5M
Iyris is creating special, high-tech glass that blocks heat, saves energy and produces electricity.
14
Country: USA | Funding: $17.8M
​Infinite Cooling's mission is to provide novel technology to enable water-sustainable thermoelectric power. Its technology reduces water consumption in evaporative cooling tower systems by over 20% by capturing water from cooling tower plumes
15
Country: France | Funding: $15.4M
Koolboks provides a storage technique due to the superior insulation and ice battery technology employed in the design. The sustainable cooling company, which offers accessible cold storage solutions to businesses across Africa
16
Country: Germany | Funding: €11.3M
MagnoTherm's cutting-edge energy conversion solutions allow cooling and heating with low pressure systems and is 40% more efficient than current systems.
17
Country: Germany | Funding: €11.3M
MAGNOTHERM builds highly efficient and sustainable cooling systems based on magnetocaloric materials. Instead of climate-damaging or hazardous refrigerant gases, it uses a temperature-active metal in combination with water.
18
Country: India | Funding: ₹957M
Smart Joules offers retrofits for energy-intensive systems like cooling, heating, compressed air and steam in commercial and industrial facilities
19
Country: USA | Funding: $10.1M
Axiom Exergy transforms the world's cooling systems into intelligent, cloud-connected batteries.
20
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
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