Briggs & Stratton PowerProtect 22kW

For years the best-selling home standby generator in America, and the sheer volume of owner reviews shows why: the 22kW carries most whole homes — two AC units with load management — and every electrician and gas fitter in the country has installed one. The G-Force 1000 engine and 67 dB noise level are unremarkable but proven; owners report units sailing through week-long outages after hurricanes. The flip side of ubiquity is that the complaint threads are equally deep: Evolution controller replacements, dealers backlogged after storms, and Generac support that owners describe as polite but powerless. The newer 24kW (7209/7210) has largely replaced it at similar money, but the 7042 remains widely stocked, slightly cheaper, and the known quantity — a big deal when your installer has done fifty of them.

The RS20A is what owners buy when the nightly drone of a 70 dB generator is a dealbreaker: Cummins holds it to 65 dB at 23 feet — dishwasher territory — while still starting a 5-ton air conditioner and managing four loads with its built-in intelligent load control. The same QSJ999G V-twin as the RS13A runs harder here, delivering 20kW on propane and 18kW on natural gas, and it ships cold-weather-ready to 0°F out of the box. Owner reviews read like Kohler's best: uneventful, reliable, quiet enough that neighbors ask if it's running. The trade-offs also mirror the RS13A — sparse residential dealer coverage makes pre-purchase service planning essential, stock frequently slips to pre-order, and the app is functional but bare-bones. For sound-sensitive neighborhoods it's arguably the class benchmark.

The 20RCA is Kohler's volume whole-house unit and the direct rival to Generac's 22/24kW, built around the bigger CH1000 V-twin. Its party trick is 41kVA of motor-starting capacity — owners regularly confirm it starts a 5-ton AC without dropping the rest of the house, which smaller-surge competitors need load-shedding modules to manage. The RDC2 controller has a strong reliability reputation, and long-term owners (this platform has been around for years) report exceptionally boring, dependable service — the best compliment a standby can get. Trade-offs are the familiar Kohler ones: 18kW on natural gas, 70 dB at full-speed operation is on the loud side, OnCue Plus monitoring trails Generac's app, and you may wait longer for both the unit and a certified installer depending on your region.

Kohler's answer to the Guardian 14kW, and the one owners pick when they've read enough Generac controller threads. The commercial-grade CH740 V-twin uses hydraulic valve lifters — no break-in, no valve adjustments — and the corrosion-proof aluminum enclosure holds up in coastal salt air where painted steel rusts. It punches above its class on motor starting with 33kVA of surge capacity via PowerBoost, so a 4-ton AC is realistic. Owner sentiment is consistent: the hardware feels a grade above Generac, but the dealer network is thinner, lead times run longer, and the OnCue Plus monitoring app is dated and clunky compared to Mobile Link. Note the honest ratings: 14kW on propane but 12kW on natural gas, and 69 dB in normal operation is louder than the spec-sheet skim suggests.

The 18kW is the value pick in the Guardian range on a dollars-per-kilowatt basis — same 816cc G-Force 800 twin as the 14kW, tuned for 18kW on propane and 17kW on natural gas, at only a few hundred dollars more. Owners in hurricane and ice-storm country consistently report it carrying a whole modest home including a 3-ton AC without drama, and the G-Flex variable-speed exercise keeps the weekly test tolerable at 65 dB. The ownership caveats are pure Generac: the Evolution 2 controller is the component that fails, dealers are the only sanctioned path for warranty work, and owners recommend buying the battery and cold-weather kit up front rather than discovering they're extras on install day. If you're between the 14 and this, most owner advice says spend up.

The biggest air-cooled generator Generac makes, and the one owners of large homes buy to avoid stepping up to liquid-cooled money. 26kW on propane (22.5kW on natural gas) with a redesigned alternator delivering 230 LRA of starting grunt means dual 5-ton AC setups are realistic with load management. It's 'smart grid ready' and runs the same Evolution 2 controller and Mobile Link stack as the rest of the line — which cuts both ways, since the controller is also the line's most-reported failure point. Owners praise the density (Generac claims 68% less space than comparable output) and the familiar service ecosystem; the grumbles are the usual dealer-dependent warranty service, the meaningful NG derate, and 67 dB of noise that a big home's yard absorbs better than a small lot does.