Mitsubishi Heavy Industries - Mahajak Air Conditioners Co., Ltd. or MACO is one of leaders in Thailand's airconditioning industry. The company was established on September 22, 1988 on an area of 68.54 rai (Plant 1 = 50.0 rai, Plant 2 = 12.5 rai, Plant 3 = 6.04 rai) in Lad Krabang Industrial Estate and all under a joint venture between Mitsubishi Heavy Industries, Ltd., Japan, a leading, world-class engineering concern, and Mahajak Group, a successful company with multifaceted business interests in Thailand.

Today, MACO manufactures superior quality air-conditioners with a capacity of more than 30 million units since establishment under the "Mitsubishi Heavy Industries" brand. The company has gained the trust and reliance of its customers for its high-quality products, on-time delivery, reasonable price and environment-friendly technologies.