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Climate Adaptation

Gates-Backed Climate Fund Invests in Sealing Leaky Buildings

As much as 30% of the air circulating through heating and cooling ducts is lost through leaks, holes and poor connections

Aeroseal’s insulation technology.

Aeroseal’s insulation technology.

Photographer: Alex Jeffries/Aeroseal

A company with technology to better insulate buildings raised $22 million from Breakthrough Energy Ventures, a fund backed by Microsoft Corp. co-founder Bill Gates that invests in climate solutions. 

Ohio-based Aeroseal LLC helps improve energy efficiency in homes and offices by injecting a fog of sealant particles into roofs and air ducts which can cover cracks and holes as large as half an inch. The goal is to prevent hot and cold air from leaking, cutting utility bills and power consumption.