Monish from Coolant discusses the work of the startup company in enhancing cooling and air conditioning using natural materials. The company aims to bring back the basics of passive design and make it accessible to the masses. They draw inspiration from nature and traditional architecture to create climate-responsive buildings. Coolant believes in open-source solutions and making their designs public to contribute to the greater good. The challenges they face include the need for patience and a long-term vision, as well as the balance between profitability and environmental impact.