From the time our founder invented the basics of modern air conditioning in 1902, Carrier has been the world leader in air conditioning, heating and refrigeration systems. A wholly-owned subsidiary of United Technologies Corporation, Carrier is built upon a legacy of innovation and commitment. Carrier offers ComfortChoice®, the industry-leading 2-way verifiable demand response thermostat. The ComfortChoice thermostat provides the utility and the consumer with a solution to effectively manage their energy usage during periods of peak energy demand.