Radi-Cool is a radiative cooling coating developed by Radi-Cool Japan Co., Ltd. It is designed to reduce surface temperatures by reflecting solar radiation and emitting thermal radiation, thereby lowering the need for air conditioning.

What were the main results of the demonstration project?

The project demonstrated that Radi-Cool coating can reduce air conditioning power consumption by up to 31.7% and an average of 18.1% under specific meteorological conditions. It also reduced roof surface temperature by up to 34.3℃ and roof space temperature by up to 9.7℃.

Where was the demonstration conducted?

The demonstration was conducted at the "Hakata Port Bayside Museum" in Fukuoka City, Japan.

What is the goal of Fukuoka City related to this project?

Fukuoka City aims to achieve net-zero greenhouse gas emissions by fiscal year 2040 and is promoting energy-saving measures for buildings, making this project relevant to their decarbonization efforts.

How does radiative cooling work?

Radiative cooling materials work by reflecting sunlight and emitting infrared radiation (heat) into the atmosphere, effectively cooling the surface without consuming energy.

Radi-Cool Radiative Cooling Coating Reduces Air Conditioning Power Consumption by Up to 31.7%

Published Mar 30, 2026 9:00 PM ・ Updated Jun 2, 2026 1:01 PM ・ 4 min read ・ Source: PR TIMES

Demonstration experiment of the radiative cooling coating "Radi-cool" achieves up to 31.7% reduction in air conditioning power consumption.

Radi-Cool Japan Co., Ltd. (Headquarters: Chuo-ku, Tokyo) and Idemitsu Energy Solutions Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo) are pleased to announce the results of the energy-saving performance demonstration project for the radiative cooling coating "Radi-cool" conducted at the "Hakata Port Bayside Museum" in Fukuoka City. In this project, under strict meteorological comparative conditions (detailed below), we confirmed a reduction in air conditioning power consumption of up to 31.7%.

▲ View of the Hakata Port Bayside Museum roof before painting

▲ View of the Hakata Port Bayside Museum roof after painting

Background and Objectives of the Demonstration Project

Fukuoka City has set a challenge target of achieving net-zero greenhouse gas emissions by fiscal year 2040 and is promoting the reduction of energy consumption and greenhouse gas emissions from public and private facilities. The port area has many buildings susceptible to solar radiation, so this project was conducted as a demonstration initiative for decarbonization by verifying its energy-saving effects.

Major Achievements of the Demonstration Project: Correlation Confirmed Between Temperature Suppression and Power Reduction

The results of this project confirmed a reduction in roof surface temperature of up to 34.3℃ and in the roof space temperature of up to 9.7℃. Furthermore, in terms of air conditioning power consumption, a comparison under identical meteorological conditions (total solar irradiance ±0.3 MJ/day, maximum temperature difference ▲ Roof surface temperature measurement status before and after painting (thermal camera)

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FACT BOX

Source: PR TIMES
Category: News

Radi-Cool Radiative Cooling Coating Reduces Air Conditioning Power Consumption by Up to 31.7%

⚡ Key Points

Background and Objectives of the Demonstration Project

Major Achievements of the Demonstration Project: Correlation Confirmed Between Temperature Suppression and Power Reduction

FACT BOX

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