Amherst / USA. The success story of the e-compressor originates in the region of Western New York. Relatively far north on the border with Canada. Here, where winter temperatures sometimes reach minus 30 degrees Celsius, things are heating up inside the MAHLE building. Whirring, beeping, silence. Careful listening in sound-insulated rooms. Testing, adjusting, testing again. Engineering design and development with a precision that cannot be seen by the naked eye. This is where the engineers spend their time. A walk through the product development and test laboratories, past test equipment, screws, and sensors, shows how a central component is brought to life.