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The best home standby generators start on their own within seconds of an outage and run on natural gas or propane for as long as the fuel lasts, so your furnace, sump pump, fridge and Wi-Fi keep working while the neighborhood goes dark. Winter storms and ice are the main reason people buy one in the fall, and installers book up fast once the first big outage hits. We compared specs, expert testing and owner reviews of current air-cooled models from Generac, Kohler, Champion, Cummins and Briggs & Stratton to pick eight worth considering, from small-home 13kW units to 26kW whole-house systems.
Part of our Home Comfort, Backup Power & Tool Guides.
Quick picks
| Product | Best for | Price range | |
|---|---|---|---|
| Generac Guardian 26kW (7291) | Best overall | $$ | See price |
| Generac Guardian 22kW (7325) | Mid-size homes | $$ | See price |
| Kohler 20RCAL-200SELS 20kW | Power quality and build | $$ | See price |
| Kohler 26RCAL-200SELS 26kW | Large homes, quiet exercise | $$$ | See price |
| Champion 14kW aXis (100837) | Value and cold climates | $ | See price |
| Cummins Quiet Connect RS20AC | Extreme weather | $$ | See price |
| Briggs & Stratton PowerProtect+ 26kW (040807) | Longest warranty at 26kW | $$ | See price |
| Briggs & Stratton PowerProtect 13kW (040742) | Small homes, tight lots | $$ | See price |
Price tiers are for the generator package only: $ = under $5,000, $$ = $5,000 to $7,500, $$$ = $7,500 and up. Installation usually adds several thousand dollars more (see the FAQ).
1. Generac Guardian 26kW (7291): Best Overall
Generac is the brand most installers carry, and the 26kW Guardian is the model to get if you want to run most of a typical house, including central air on many systems, without picking and choosing circuits. Popular Mechanics named it the best standby generator for most homes and called out Generac’s round-the-clock customer support. It ships with a 200-amp automatic transfer switch and free Mobile Link Wi-Fi monitoring, so you can check its status and maintenance alerts from your phone.
Key specs
- 26kW on propane, 22.5kW on natural gas
- 200A automatic transfer switch included
- 999cc G-Force engine
- 67 dB at about 23 feet
- Wi-Fi monitoring with the Mobile Link app
- 5-year limited warranty
👍 Pros
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👎 Cons
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What owners say: Owners and reviewers like the app alerts and how easy it is to find a local Generac dealer; the usual complaints are price and the cost of keeping up with service in very cold climates.
2. Generac Guardian 22kW (7325): Best for Mid-Size Homes
The 7325 is the current version of Generac’s long-running 22kW model, and it is the sweet spot for many 1,500 to 3,000 square foot homes. Its 200-amp service-rated switch includes load management for up to four air conditioners, which lets the generator shed big loads instead of overloading. A Quiet-Test mode runs the weekly self-check at about 57 dB, noticeably quieter than full-load operation.
Key specs
- 22kW on propane, 19.5kW on natural gas
- 200A service-entrance transfer switch with load management
- About 67 dB under load, about 57 dB in Quiet-Test
- Under 5% total harmonic distortion, safe for electronics
- Aluminum enclosure rated for 150 mph winds
- 5-year limited warranty; Wi-Fi monitoring
👍 Pros
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👎 Cons
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What owners say: Buyers like that it covers the whole house in most mid-size homes for less than the 26kW; installers note that sizing should be checked if you have more than one large air conditioner. If you need more headroom, Generac also sells a 24kW version (7326) in the same housing.
3. Kohler 20RCAL-200SELS 20kW: Best Power Quality
Kohler has a strong reputation among electricians for build quality, and this 20kW package shows why. Its PowerBoost voltage regulation and high motor-starting capacity help it handle the startup surge of a central air conditioner, and it restores power in about 10 seconds after an outage. Panels come off without tools, which makes routine service easier. Remote monitoring is available through Kohler’s OnCue Plus system.
Key specs
- 20kW on natural gas or propane
- 200A outdoor service-entrance RXT transfer switch included
- Kohler CH1000 V-twin engine
- 41 kVA motor starting; under 5% harmonic distortion
- Power restored in about 10 seconds
- 5-year / 2,000-hour warranty
👍 Pros
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👎 Cons
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What owners say: Owners and trade pros tend to praise the build quality and steady power output; the main drawbacks mentioned are fewer dealers than Generac in some regions and a less polished app experience.
4. Kohler 26RCAL-200SELS 26kW: Best for Large Homes
For bigger homes that want Kohler’s power quality, the 26kW model adds output and a very quiet Eco-Exercise mode that runs the weekly self-test at about 56 dB. The Command PRO engine uses hydraulic valve lifters, which means fewer valve adjustments over the generator’s life. Kohler’s warranty here covers parts, labor and travel for five years or 2,000 hours.
Key specs
- 26kW on natural gas or propane
- 200A service-entrance RXT transfer switch included
- Kohler Command PRO 999cc engine with hydraulic lifters
- About 56 dB in Eco-Exercise, about 67 dB under load
- OnCue Plus remote monitoring
- 5-year / 2,000-hour warranty (parts, labor, travel)
👍 Pros
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👎 Cons
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What owners say: Buyers value the quiet test cycle and the solid enclosure; the most common hesitation is the price premium over Generac and Briggs at the same output.
5. Champion 14kW aXis (100837): Best Value and Best for Cold Climates
Champion’s 14kW aXis is the lowest-cost package here and carries the longest generator warranty, 10 years. Bob Vila picked it as the best standby generator for cold weather because its 24-volt starting system is rated to start down to -22°F without an extra warming kit. It is also the quietest published rating in this guide at 62 dB. The trade-off is output: 14kW covers essentials and smaller homes, but not a large house running central air.
Key specs
- 14kW on propane, 12.5kW on natural gas
- 200A automatic transfer switch with load management
- 62 dB at about 23 feet
- Cold starting rated to -22°F
- Power-line communication, so no control wires between generator and switch
- 10-year limited warranty on the generator, 2 years on the switch
👍 Pros
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👎 Cons
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What owners say: Owners appreciate the price, the simpler wiring and the long warranty; the complaints that come up are occasional startup hiccups and limited capacity for homes with big electric loads.
6. Cummins Quiet Connect RS20AC: Best for Extreme Weather
Cummins builds generators for hospitals and data centers, and its residential 20kW unit is built for harsh climates: it is rated to operate from -40°F to 122°F and its enclosure is rated for 180 mph wind loads. Remote monitoring by phone, tablet or computer is built in. Pay attention to the suffix: the RS20AC includes a 200-amp transfer switch, while the cheaper RS20A does not.
Key specs
- 20kW, natural gas or propane (field-selectable)
- 200A service-entrance transfer switch included (RS20AC)
- 65 dB at about 23 feet
- Operates from -40°F to 122°F
- Built-in remote monitoring
- 5-year / 2,000-hour warranty
👍 Pros
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👎 Cons
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What owners say: Owners report it runs the whole house reliably and like checking it from their phone; complaints focus on shipping costs and the fact that remote alerts stop if your home router has no backup power.
7. Briggs & Stratton PowerProtect+ 26kW (040807): Best Warranty at 26kW
Briggs & Stratton’s PowerProtect+ matches the big Generac and Kohler units on output but adds a 7-year limited warranty, the longest in the 26kW class here. Its Vanguard V-twin delivers strong motor-starting capacity for air conditioners and well pumps, and the aluminum enclosure is rated for 186 mph winds. Note that the generator-only 040807 does not include a transfer switch, so budget for one or buy a kit that bundles it.
Key specs
- 26kW on natural gas or propane
- Transfer switch sold separately
- About 63 dB during exercise, about 65 dB normal operation
- 65.5 kVA motor starting
- Operates from -20°F to 104°F
- 7-year limited warranty
👍 Pros
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👎 Cons
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What owners say: Buyers like the warranty and quiet operation for a 26kW unit; the main gripe is that the switch and remote monitoring add to the real total cost.
8. Briggs & Stratton PowerProtect 13kW (040742): Best for Small Homes
If you only need the essentials, such as furnace blower, fridge, sump pump, lights and outlets, the 13kW PowerProtect is a compact choice. Its front-facing exhaust lets it sit as close as 18 inches from the house, which helps on narrow lots, and the weekly self-test lasts just 16 seconds to save fuel. Popular Mechanics picked the earlier 12kW PowerProtect as its best option for small homes.
Key specs
- 13kW on propane, 11kW on natural gas
- 100A, 16-circuit automatic transfer switch included
- Vanguard V-twin engine; 37 kVA motor starting
- Can be installed 18 inches from the home
- 16-second weekly self-test
- 6-year warranty (parts, labor, travel)
👍 Pros
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👎 Cons
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What owners say: Owners of smaller homes like the tidy footprint and warranty; the recurring caution is that a 16-circuit switch means deciding up front which circuits get backup.
How to choose a home standby generator
- Size it to your loads: HomeGuide’s rule of thumb is 13 to 16kW for homes under 1,500 square feet, 17 to 20kW for 1,500 to 3,000 square feet and 22 to 25kW or more for 3,000 to 5,000 square feet. Central air, well pumps and electric dryers drive the number up, and motors can draw up to twice their running watts to start. Use our power station and generator sizing calculator to add up your loads before you talk to an installer.
- Fuel: Natural gas runs as long as the utility keeps gas flowing but lowers output (a 26kW propane rating is about 22.5kW on gas). Propane works anywhere but runtime depends on the tank; Bob Vila estimates roughly 50 hours on a 100-gallon tank and about 125 hours on 250 gallons.
- Transfer switch: A 200A service-entrance switch backs up the whole panel; a 100A, 16-circuit switch powers only chosen circuits. Load management lets a smaller generator handle central air by shedding loads. Check whether your package includes the switch.
- Installation and permits: HomeGuide puts typical installed cost at $6,000 to $11,000, and more for large units or long gas runs. Permits, a concrete or composite pad and a licensed electrician and gas fitter are required in most areas.
- Noise and placement: Most units run at about 60 to 70 dB at roughly 23 feet, similar to a central air conditioner. Follow the manufacturer’s clearance rules and local code, avoid flood-prone low spots, and check HOA and noise rules.
- Warranty and maintenance: Warranties range from 5 years (Generac, Kohler, Cummins) to 6 to 7 years (Briggs) and 10 years (Champion). Plan on oil, filter and battery service; HomeGuide lists annual service plans at roughly $200 to $650.
FAQ
How much does a whole-house generator cost installed?
Most homeowners pay about $6,000 to $11,000 in total for a typical air-cooled unit, according to HomeGuide, with large units or complicated gas and electrical runs reaching well beyond that. The generator package itself runs roughly $5,000 to $9,000 for the 13kW to 26kW models in this guide.
What size standby generator do I need?
Roughly 13 to 20kW covers homes up to about 3,000 square feet, and 22kW or more suits larger homes or those with multiple air conditioners. The accurate way is to add up the running watts of everything you want powered and allow for motor startup surges, then confirm with your installer.
Can I install a standby generator myself?
It isn’t recommended. Installation involves permits, a gas line and a transfer switch tied into your electrical service, and experts advise using a licensed electrician and gas fitter. Some manufacturers also tie warranty coverage to proper installation, so read the warranty terms before you buy.
How long can a standby generator run during an outage?
On natural gas it can run as long as gas service continues, with breaks for oil checks the manufacturer recommends during long outages. On propane, runtime depends on tank size and load. Follow the manufacturer’s maintenance schedule for extended runs.
Related guides
- The Best Dual Fuel Generators of 2026
- The Best Home Battery Backup Systems of 2026 for Outages
- The Best Portable Power Stations for Home Backup of 2026
- Winter Storm and Power Outage Prep
- Home Comfort, Backup Power & Tool Guides
Sources
Bob Vila: The best standby generators; Popular Mechanics: Home standby generators; Consumer Reports: How to choose the right size generator; HomeGuide: Whole house generator cost; Angi: Generator installation cost; manufacturer and authorized-dealer specifications for Champion, Generac, Kohler, Cummins and Briggs & Stratton. Owner feedback is summarized in our own words from public reviews. Photos courtesy of Unsplash.