The system can help avoid the need for air-conditioners during summer months. During those months one could reduce the electricity bills by operating the passive cooling system, he said.

The system could be very effective in Europe where the temperature during the summer is not high, Mathur said. However, he agreed that it may not work well in very high temperature situations.

He said it took six to eight months to design the first part which is now installed at the Centre for Science and Environment in New Delhi. The second part of the system is yet to be installed.

According to Mathur, the system is energy efficient, environment-friendly and also cost-effective.