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, $6,000–$7,500 | 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, $4,500–$6,000 | 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, $4,500–$6,000 | Check price of the Generac Guardian 22kW (7210) on Amazon |
| Kohler 26RCAL 26kW | 8.9 | 26 kW | Natural gas (24kW) + liquid propane (26kW) | 69 dB | Price tier: Premium, $6,000–$7,500 | 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, $4,500–$6,000 | 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, $4,500–$6,000 | Check price of the Generac Guardian 18kW (7182) on Amazon |
Check your essential loads and get the generator size your home actually needs.
Size my generatorThe true installed price: unit, labor, gas line, panel work, pad and permits.
Estimate my cost10-year cost comparison plus the honest convenience trade-offs.
CompareSize your standby generator correctly: how to add up running watts, starting surges, fuel derates and safety margins — plus a free kW calculator.
Head-to-headGenerac vs Kohler standby generators compared: power, engines, enclosures, warranties, dealer networks and price. Head-to-head for 2026.
Head-to-headStandby vs portable generator compared honestly: 10-year costs, fuel, noise, convenience, and when a portable is actually the smarter buy.
Cost breakdownWhat a standby generator really costs installed: unit, labor, gas line, panel work, pad, permits and propane tanks — with a free cost estimator.
OwnershipKeep your standby generator ready: the annual maintenance checklist — oil, filters, battery, exercise cycle — plus the failures to watch for.
Head-to-headGenerac 22kW vs 24kW compared: same engine, different alternator, fuel ratings, efficiency and price. Which Guardian is right for your home?
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How we score generatorsEvery 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.