The Generac Guardian series uses air-cooled engines and covers residential standby applications from 10kW to 26kW. Air cooling is appropriate for the duty cycle of a residential standby generator: weekly exercise cycles and occasional outage service totaling 50 to 150 hours per year. Guardian models are sized for single-family homes and are the most widely installed residential standby generators in the United States.
The Generac Protector series uses liquid-cooled engines and begins at 22kW, targeting commercial properties, multi-family buildings, medical facilities, light industrial applications, and large residential estates with higher continuous power demands. Liquid cooling allows sustained operation at higher ambient temperatures and higher duty cycles than air-cooled engines can reliably maintain. The Protector series also uses a heavier enclosure and more robust alternator for commercial service environments.
For a standard single-family home, the Guardian series is the correct product line. The Protector series is appropriate when continuous runtime exceeds what residential air-cooled generators are designed for, when the facility load exceeds 26kW, or when a commercial building permit requires commercial-grade equipment. IB Lighting carries Guardian models across the full residential range. Browse our Generac home standby generators or contact us for configuration guidance. Free Freight Insurance Included.