We compared 10 home standby generators on power, fuel, transfer switch, noise and price, so the lights stay on — and you skip the research.
One clear winner for each kind of home. Tap a card for the full review.
Large homes (2,500+ sq ft) with multiple AC zones, electric appliances, or a home office that can't go dark.
Budget-conscious buyers and cold climates — the best value standby generator with the best warranty.
Mid-size homes that want Kohler build quality at a mid-range price — and the quietest exercise cycle in this roundup.
The most popular whole-house size in America — 2,500 sq ft homes with central air.
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14 kW covers essentials plus one AC. 18–20 kW handles most of a 1,500–2,500 sq ft home. 22–26 kW is true whole-house backup. Get your exact number:
The top whole-house standby generators of 2026, ranked.
| Model | Score | Power | Fuel | Noise | Price tier | Buy |
|---|---|---|---|---|---|---|
| Generac Guardian 26kW (7291) | 9.3 | 26 kW | Natural gas + liquid propane | 67 dB | Price tier: Premium | Check price of the Generac Guardian 26kW (7291) on Amazon |
| Generac Guardian 24kW (7209) | 9.1 | 24 kW | Natural gas + liquid propane | 67 dB | Price tier: Mid-range | Check price of the Generac Guardian 24kW (7209) on Amazon |
| Generac Guardian 22kW (7210) | 9.0 | 22 kW | Natural gas + liquid propane | 67 dB | Price tier: Mid-range | Check price of the Generac Guardian 22kW (7210) on Amazon |
| Kohler 26RCAL 26kW | 8.9 | 26 kW | Natural gas (24kW) + liquid propane (26kW) | 67 dB | Price tier: Premium | Check price of the Kohler 26RCAL 26kW on Amazon |
| Kohler 20RESCL 20kW | 8.8 | 20 kW | Natural gas (18kW) + liquid propane (20kW) | 64 dB | Price tier: Mid-range | Check price of the Kohler 20RESCL 20kW on Amazon |
| Generac Guardian 18kW (7182) | 8.8 | 18 kW | Natural gas + liquid propane | 67 dB | Price tier: Mid-range | Check price of the Generac Guardian 18kW (7182) on Amazon |
Want these numbers as a spreadsheet? Download the same table as CSV or JSON(CC BY 4.0, free to cite).
Check your essential loads and get the generator size your home actually needs.
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OwnershipStandby generator weekly exercise cycle on Generac and Kohler units: run time, schedule options, whether the load transfers, and what resets the clock.
Buying basicsAutomatic transfer switch explained: how it detects an outage, starts your standby generator and moves your house to generator power, per Generac's paper.
Every model we cover is a permanent, automatic whole-house system. No portables, no manual transfer panels.
kW ratings, fuel derates and warranty terms verified across manufacturers, reviews and owner reports.
Calculators built from real specs turn "what size generator?" into a number, not a guess.