Tongdy Control Technology Co., Ltd., founded in 1999 in Beijing China, is a leading hi-tech company of designing and manufacturing products of monitoring and control temperature, humidity and IAQ. Now Tongdy can supply several tens of controllers for HVAC, as well as various IAQ detector, monitor and controller. As a high level control technology company, Tongdy is committed to R&D various digital controllers with high quality for indoor ambiance. And Tongdy is famous in its professional design and service. Now Tongdy's main product covers programmable and non-programmable digital room thermostats for HVAC systems, humidity controllers, carbon dioxide detectors/monitors/controllers/transmitters for many applications. As well as covers carbon monoxide and ozone detectors/monitors/controllers. A product line of IAQ detectors/controllers also can be supplied to detect and indicate indoor air quality and control a fan. Tongdy’s almost products supply RS485 communication interface to connect to PC or other system. Some of thermostats can supply BacTalk interface to connect BacNet bus. With a team of highly talented engineers who have extensive research experiences, Tongdy can provide products with complex and special request, also with good stability, reliability and performance, and at lower prices! In addition, Tongdy can provide customized service to meet different customers’ special requirements. These ODM service have gotten outstanding repute in prompt feedback and exact comprehending, al well as providing samples in a short time. Tongdy’s various products have been exported to Europe, North America, Asia &Pacific Ocean district, Gulf Area, and South America.