The look of the AHR Expo Show floor is not the only aspect that has changed since the first International Heating and Ventilating Exposition in 1930.

The Expo has grown from a portion of the National Exposition of Power and Mechanical Engineering to what is known as the “world’s largest HVAC&R marketplace.”

The look and some technology in the products has changed, and many attendees have swapped suits and ties for tennis shoes. But some aspects of the Show have remained the same, such as the Show’s drive toward innovation.