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Generator dealers in O'Fallon, MO

22 authorized Generac, Briggs, Kohler dealers offering sales, service, financing, installation · 2 with customer ratings.

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Generac 14kW Whole Home Generator, Transfer Switch & Cellular Capability
O'Fallon, MO · GeneracGenerac 14kW Whole-Home Standby GeneratorLowest price in 30 days$4,799−18%List: $5,839Price as of Aug 16, 2026 · the price shown on Amazon at checkout applies.See This Deal on Amazon

Independent recommendation from GenDealers — any authorized dealer below can quote installation.

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22 dealers

Featured spotYour business at the top of O'Fallon, MOFeatured listings show above every dealer in this city with your logo, description, and direct contact buttons.Get this spot
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    Generac Guardian 22kW Home Generator, Transfer Switch & WiFi Monitoring
    More options · GeneracGenerac Guardian 22kW Home Standby GeneratorThe long-running Guardian 22kW with a 200-amp service-rated transfer switch and Mobile Link Wi-Fi.See Current Price on Amazon

    Independent recommendation from GenDealers — have a local dealer above quote installation.

Dealers in nearby cities

Dardenne Prairie, MOLake St. Louis, MOCottleville, MOSt. Paul, MOJosephville, MOWeldon Spring Heights, MOSt. Peters, MOWeldon Spring, MOWentzville, MO
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About generator dealers in O'Fallon, MO

GenDealers lists 22 authorized generator dealers in and around O'Fallon, MO — independent businesses certified to sell, install and service Generac, Briggs, Kohler home standby generators, portable generators and transfer switches. Listings show each dealer's brand authorization tier, services (sales, service, financing, installation), customer rating, phone number and website so you can compare before you call.

Not sure what size you need? Use the generator sizing calculator first, then ask two or three dealers here for installed quotes. New to standby power? Start with Generator 101.