Business Today has a profile of Mumbai-based start-up Green India Building Systems and Services (GIBSS) which uses geothermal technology to slash the power requirements of air conditioners. In a conventional system, the cooling tower of an air conditioning plant sucks out the heat from an enclosed space, and ejects it into the environment. The technology GIBSS has designed uses instead a heat exchanger system to deflect the heat into the earth's crust. As the temperature just a few metres below the earth's surface is much lower than that of the air above, the energy transfer is more efficient, reducing power consumption. ...Equally challenging has been convincing customers. "Most companies didn't know what we were talking about," says Shenoy. The companies were also taken aback by the installation costs, which range from a few lakh rupees to a few crores, depending on the size of the establishment. "High upfront costs are the biggest roadblock," says Ku...