i2Cool is a technology start-up supported by the City University of Hong Kong's "HK TECH300" Entrepreneurship Program and Hong Kong Science and Technology Park. Professors, physicians, and young scientists from the School of Energy and Environment of the City University of Hong Kong comprise the main research and development team. To match the trend towards emission reduction and advance the development of energy-saving technology globally, it is committed to developing and promoting electricity-free cooling technology (also known as passive radiative cooling technology).

i2Cool was formally founded in June 2021. The group had spent over seven years developing passive radiative cooling technology. After years of testing and modification, the expensive passive radiative cooling technology has successfully been converted into affordable commercial goods. i2Cool has consistently followed the development strategy of "green, energy-saving, zero-carbon upgrading, carbon peaking and carbon neutrality goals innovation and development," maintained the leading position in the industry's technology through independent innovation, and contributed consistently to the development of a greener, more sustainable world.