Guardian home standby generators have been manufactured for over 40 years by Generac Power Systems, Inc., headquartered in Whitewater, Wisconsin. These units and accessory products are designed to provide emergency automatic home standby generation of power that can be installed during new construction or retrofitted into existing residences and light industrial businesses. The residential emergency home standby generator is permanently installed outside (similar to an air-conditioning unit), to supply electrical power to all pre-selected lights, appliances, sump pumps and water pumps, and are powered by either natural gas or LPG. Models range from 3,400 to 40,000 watts. They work with a matched automatic transfer switch that responds within seconds when utility power shuts down, even when no one is at home.

Guardian generators are manufactured at three separate production facilities. One produces the air-cooled and portable units, another the liquid-cooled units, and a special fabrication facility makes all the generator enclosures. By utilizing a business strategy of vertical integration, Guardian designs and manufacturers the majority of their own engines (OHVI®), generator heads, transfer switches and weather protective enclosures. They design, engineer, 100% test and manufacture every system they sell... and that is unique to Guardian. For that, and a wide number of other reasons, Guardian has earned the position of being the #1 Selling Home Standby Generator in America.