Published on Jul 19, 2017. Heating and cooling account for roughly 48% of the energy use in a typical U.S. home, making it the largest energy expense for most families. In the commercial building sector, the cost is approximately 40%. Johnson Controls, one of the leading providers of HVAC, Fire and Security systems in the world, is changing how spaces are viewed and controlled. As the inventors of the first thermostat, Johnson Controls has innovated once again with GLAS. Utilizing Windows 10 IoT Core, Cortana voice services, and Azure Cloud, GLAS is a simple to use, elegant thermostat that brings leading energy savings and air quality monitoring to everyday spaces. Johnson Controls is reinventing the thermostat and our lives.