Sigma Air Conditioning is a leading global company in the development of bespoke Heavy Duty HVAC Systems for the Mining, Industrial, Defence and Track maintenance markets and an OEM supplier to global brands. With over 65 years of experience in specialised HVAC solution, our products are designed & engineered in Australia for global deployment.

Sigma Air Conditioning is part of the Knorr-Bremse Group, based in Munich Germany, the world’s leading provider of system solutions for rail and commercial vehicles.

Design & Engineering Expertise

Sigma is at the forefront of HVAC technology by developing and implementing new and innovative bespoke solutions for heavy-duty applications.

Continuous Improvement

Sigma Air Conditioning is as ISO9001 certified company and has extensive Research and Development facilities to ensure SIGMA's equipment continues to deliver maximum performance, value and reliability with minimum overall life cycle cost to our customers

Excellent Support Services

With state of the art manufacturing plants in Sydney and Brisbane and service branches throughout Australia and USA, we provide uncompromised customer support.

Our Branches

New South Wales (Head Office)

23 – 29 Factory Street,

Granville, NSW 2142

Tel: +61 2 88636 500

Fax: +61 2 9897 9980


719 Boundary Road,

Darra, Qld, 4076

Tel: +61 7 3713 7411

Fax: +61 7 3713 7422


50 Enterprise Street,

Paget, Mackay, Qld 4740


9 &13 Stoney Way

Derrimut VIC 3030

Tel: +61 3 8353 6400

Fax: + 613 9311 1135

Western Australia

33 Colin Jamieson Drive

Welshpool, WA 6106

Tel: + 618 9350 2400

Fax: + 618 9350 2401

Port Hedland

20 Anderson St,

Port Hedland WA 6721


1920 Downs Drive,

West Chicago, IL 60185 USA