Welcome to the World of Sigma Coachair Group.

Sigma Coachair Group is a leading global company in the development of Transport and Heavy Duty HVAC Systems for the Rail, Bus, Mining, Industrial and the demanding Defence markets.

The World of Sigma Coachair Group truly covers the Globe across several market groups. The products are produced with over 30 years of broad experience in the air conditioning markets.

Sigma Coachair Group provides a "whole of life" outlook for its products and provides tailored system solutions that deliver true value to our customers. 

Sigma Coachair Group is a Quality Assured company to ISO9001 at all its operations and has extensive Research and Development  facilities to ensure Sigma Coachair Group's equipment delivers maximum performance, value and reliability with minimum overall life cycle cost to our customers.

Sigma Coachair Group designs, manufactures, supplies and supports through "whole of life" for the following product brands:

The SIGMA Rail Products have for over 30 years been providing customised solutions for railway vehicles applications around the world. The Sigma Rail experience extends from the United Kingdom, through Europe, Asia, Australia and the North American continents. The product range covers both light and heavy rail passenger transit, high speed intercity as well as locomotive freight HVAC. Sigma Rail provides total solutions that are both reliable and environmentally friendly for the harsh rail vehicle environment.

 The CoachAir Brand represents HVAC Systems for the Bus and Coach market. The products are generally roof mounted and provide quiet reliable operation across rigid vehicles from 7 to 14 m in length and articulated vehicles up to 18m. The product boasts the only true long life brushless motor combination and offers an alternative configurations to suit specific customer needs.

SIGMA Mining and Industrial products are world reknowned for the ability to meet the most arduous operating environments (Dust, Vibration, Extreme Temperature) while delivering quiet and reliable performance. These products are ideally suited to applications where machine downtime is expensive (productivity loss) and the process demands the highest reliability while at the same time maintain optimum working conditions for the operators to achieve maximum productivity rates.

Service and Maintenance. Sigma Coachair Group offers and can provides a full range of aftermarket services and parts for installation, commisioning, maintenance and contract servicing to support all systems through their "Whole of Life".

Sigma Coachair Group provide customisable equipment, installation and complete after market service that can deliver system solutions for your high temperature, high vibration, and high capacity HVAC application