ON THE CURVE
Image courtesy of Northeast Ohio Regional Sewer District

| Image Credit: 100th Anniversary Press Kit - Carrier Corp
In 1902, Sackett-Wilhelms Lithographing & Publishing Company needed a system to control the humidity in their factory to prevent paper from soaking up moisture and expanding. As a result, Willis Carrier created the world’s first air conditioning unit. His invention was able to control the temperature, humidity and air circulation, while also cleaning the air. It worked by pulling in air through a filter, passing the air over coils filled with coolant and then venting the cooled and dehumidified air back out.

| Image Credit: mallinka1 - stock.adobe.com
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