"Radi-cool" is a radiative cooling paint developed by Idemitsu Energy Solutions and Radicool Japan that helps reduce building temperatures by reflecting solar heat and emitting infrared radiation.

What were the main findings of the demonstration project?

The project confirmed that "Radi-cool" 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 the space under the roof by up to 9.7℃.

Where was the demonstration project conducted?

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

What is the significance of this technology for Fukuoka City?

Fukuoka City aims to achieve net-zero greenhouse gas emissions by 2040. This technology contributes to reducing energy consumption and greenhouse gas emissions from buildings, supporting the city's decarbonization goals.

What conditions were used to compare the energy savings?

The comparison was made under strict meteorological conditions, ensuring minimal variation in total solar irradiance (±0.3 MJ/day) and maximum temperature difference (less than ±1.0℃) between the painted and unpainted surfaces.

Idemitsu Energy Solutions Reduces Air Conditioning Power Consumption by Up to 31.7% with Radiative Cooling Paint "Radi-cool"

Published Mar 30, 2026 8:00 PM ・ Updated Jun 2, 2026 1:01 PM ・ 4 min read ・ Source: PR TIMES

Idemitsu Energy Solutions announces demonstration results showing up to 31.7% reduction in air conditioning power consumption using radiative cooling paint.

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

▲ Appearance before and after painting the roof of Hakata Port Bayside Museum

Background and Objectives of the Demonstration Project

Fukuoka City has set a 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. Since there are many buildings in the port area with structures susceptible to solar radiation, this project was conducted as a demonstration initiative for decarbonization by verifying its energy-saving effects.

Key Results of the Demonstration Project: Correlation between Temperature Suppression and Power Reduction Confirmed

The results of this project confirmed a reduction of up to 34.3℃ in roof surface temperature and up to 9.7℃ in the space under the roof. Furthermore, in terms of air conditioning power consumption, a comparison under the same meteorological conditions (total solar irradiance ±0.3 MJ/day, maximum temperature difference less than ±1.0℃) showed a reduction of up to 31.7% and an average of 18.1% (5 cases) before and after painting.

▲ Roof surface temperature measurement status before and after painting (thermal camera)

▲

FACT BOX

Source: PR TIMES
Category: News

Idemitsu Energy Solutions Reduces Air Conditioning Power Consumption by Up to 31.7% with Radiative Cooling Paint "Radi-cool"

⚡ Key Points

Background and Objectives of the Demonstration Project

Key Results of the Demonstration Project: Correlation between Temperature Suppression and Power Reduction Confirmed

FACT BOX

Editorial & Verification Standards

FAQ

Cite this article — HOW TO CITE

AI CRAWLER ACTIVITY