Top 14 HVAC startups in USA
Dec 09, 2025
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19
1
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.
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
Funding: $266.6M
BlocPower is offering smart, all electric heating, cooling, and hot water systems to building owners for no money down.
BlocPower is offering smart, all electric heating, cooling, and hot water systems to building owners for no money down.
3
Funding: $214.9M
Phononic innovates solid state semiconductor solutions that displace compressors, heat sinks and fans for cooling & heating
Phononic innovates solid state semiconductor solutions that displace compressors, heat sinks and fans for cooling & heating
4
Funding: $174.5M
Dandelion is an Alphabet spinout that develops geothermal heating, air-conditioning and cooling systems
Dandelion is an Alphabet spinout that develops geothermal heating, air-conditioning and cooling systems
5
Funding: $74.9M
75F is a predictive and proactive IoT-based building automation system that addresses HVAC, lighting, and equipment control needs.
75F is a predictive and proactive IoT-based building automation system that addresses HVAC, lighting, and equipment control needs.
6
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.
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.
7
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.
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.
9
Funding: $20.5M
Bedrock Energy develops drilling technology and advanced subsurface simulation software to enable geothermal heating and cooling.
Bedrock Energy develops drilling technology and advanced subsurface simulation software to enable geothermal heating and cooling.
10
Funding: $12.7M
Flair makes smart vents and wireless thermostats and advanced software for residential heating and cooling.
Flair makes smart vents and wireless thermostats and advanced software for residential heating and cooling.
11
Funding: $12.8M
Harvest Thermal develops a control system for home use that integrates heating, hot water, and cooling with thermal storage.
Harvest Thermal develops a control system for home use that integrates heating, hot water, and cooling with thermal storage.
12
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
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
13
Funding: $1M
Breezi builds wireless devices that enable homeowners to detect problems with their HVAC systems before they become severe.
Breezi builds wireless devices that enable homeowners to detect problems with their HVAC systems before they become severe.
14
Hydronic Shell Technologies provides HVAC and facade system to construction industry that enable energy retrofits.
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