Generac Guardian Series 20kW Generator

Ten seconds after the power goes out, this whole-house solution kicks in to get the lights back on. With a 20kW capacity, it's powerful enough to supply two full-size central-A/C units, but the current is clean enough to power delicate electronics like laptops. You'll have to spring for a professional installation, but the Generac can run for weeks on natural gas or propane. [$4,080; generac.com]

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