ALTER AIRCONDITIONING COMPANY LTD., was established in
1989 as a sub-contracting company mainly involving in the construction heating, Ventilation and airconditioning systems/clean rooms/ environmental building and factories utilities systems. Later in 1991 a joint-venture company with a Japanese air handling manufacturer was extablished to assemble air handling units in Thailand to serve the local Japanese market only. At the end of 2003, the Thai partners decided to split out to serve the local market more comprehensively with newer technology from European manufacturers.