Engine cooling and HVAC system supplier Behr is expanding its North American headquarters in Troy, Michigan, writes Mark Wilkinson. The company is adding a 10,000 sq-ft office facility to house North American human resources, purchasing and accounting operations to cater for mushrooming interest in North America. This joins Behr's award-winning 'Best of Troy' $US34 million technical centre that itself already covers 80,000 sq ft.