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Home/Whole-Home Generators
Standby power buying guide

Best Whole-Home Generators of 2026

We compared Generac's current standby packages by usable capacity, transfer equipment, monitoring, owner feedback and total-project value—not wattage alone.

Updated July 2026 · By the EquipmentRanked research team
17systems evaluatedNo pay-to-play scores
Best overallBest valueLarger homesManaged loads
Our top picks

The five worth your shortlist

Every pick is scored on a 10-point scale using the same category-specific criteria.

1
Best overall
Generac Next Generation 22kW Standby GeneratorGenerac · 7325 · 22kW
#1 Whole-Home Generator

Generac Next Generation 22kW Standby Generator

The best balance of capacity, equipment and total project cost

  • 22kW LP / 21kW natural-gas output
  • 200A automatic transfer switch included
  • Cellular Mobile Link monitoring built in
4.2(242 reviews)
9.8/ 10
Exceptional$6,506.10Check price at Lowe's
See our full take +
Our verdict

The 22kW package is the most convincing starting point for a typical whole-home project: meaningful HVAC and appliance capacity without automatically paying for the largest enclosure in the lineup. A licensed installer still needs to validate the load and fuel plan.

Output22kW LP
Transfer switch200A
Response10 sec

What we like

  • Strong capacity for many full-home plans
  • Whole-home surge protection in the included switch
  • Five-year limited warranty

Keep in mind

  • –Professional installation is a major added cost
  • –Final capacity depends on fuel and load calculations
2
Best value
Generac Next Generation 18kW Standby GeneratorGenerac · 7324 · 18kW
#2 Whole-Home Generator

Generac Next Generation 18kW Standby Generator

A smarter spend for efficient homes and managed loads

  • 18kW dual-fuel standby output
  • 200A transfer switch included
  • Automatic operation and remote monitoring
4.3(107 reviews)
9.6/ 10
Outstanding$5,975.10Check price at Lowe's
See our full take +
Our verdict

For a home with modest central air, efficient appliances, or a well-designed load-management plan, the 18kW model can deliver the standby experience most buyers want while keeping equipment cost in check.

Output18kW LP
Transfer switch200A
FuelNG / LP

What we like

  • Lower equipment price than 22kW+ models
  • Good fit for efficient or load-managed homes
  • Same monitoring and warranty platform

Keep in mind

  • –May require HVAC load management
  • –Less expansion headroom
3
Best for larger homes
Generac Next Generation 26kW Standby GeneratorGenerac · 7328 · 26kW
#3 Whole-Home Generator

Generac Next Generation 26kW Standby Generator

More breathing room for larger HVAC and electrical loads

  • 26kW liquid-propane capacity
  • 200A service-entrance transfer switch
  • Automatic exercise and low-oil protection
4.1(106 reviews)
9.4/ 10
Outstanding$7,253.10Check price at Lowe's
See our full take +
Our verdict

The 26kW package makes sense when a detailed load calculation shows that 18–22kW would force uncomfortable compromises. It is a capacity upgrade, not an automatic upgrade for every home.

Output26kW LP
Transfer switch200A
Warranty5 year

What we like

  • Useful headroom for bigger homes
  • Can reduce aggressive load shedding
  • Built-in cellular controls

Keep in mind

  • –Higher fuel demand
  • –Added capacity may be wasted without a load study
4
Highest capacity
Generac Next Generation 28kW Standby GeneratorGenerac · 7329 · 28kW
#4 Whole-Home Generator

Generac Next Generation 28kW Standby Generator

Maximum air-cooled headroom for demanding residences

  • 28kW liquid-propane output
  • 200A whole-home transfer equipment
  • Designed for high-demand residential plans
4.4(41 reviews)
9.2/ 10
Excellent$8,387.10Check price at Lowe's
See our full take +
Our verdict

This is the specialist pick for a genuinely demanding load profile. Buyers should confirm that the gas meter, propane storage, service equipment and budget can support the extra capacity before choosing it over the 22 or 26kW packages.

Output28kW LP
Transfer switch200A
FuelNG / LP

What we like

  • Most capacity in this comparison
  • Best chance of carrying concurrent large loads
  • Remote controls and five-year coverage

Keep in mind

  • –Highest equipment and operating cost
  • –Only 41 Lowe's reviews in the current listing
5
Best for managed loads
Generac Next Generation 14kW Standby GeneratorGenerac · 7323 · 14kW
#5 Whole-Home Generator

Generac Next Generation 14kW Standby Generator

Essential whole-panel protection with disciplined load control

  • 14kW dual-fuel standby output
  • 200A automatic transfer switch
  • Best suited to prioritized circuits and loads
3.8(84 reviews)
8.9/ 10
Very good$5,255.10Check price at Lowe's
See our full take +
Our verdict

The 14kW model can be a rational system—not a cut-rate one—when an installer intentionally prioritizes essentials and manages HVAC or other large loads. It should not be represented as unrestricted whole-home power.

Output14kW LP
Transfer switch200A
Best forManaged loads

What we like

  • Lowest equipment price here
  • Full-size transfer equipment included
  • Automatic backup and cellular monitoring

Keep in mind

  • –Not enough for every load simultaneously
  • –Lowest owner rating in this group

*Prices shown were observed during our latest review and can change. Check the retailer for current pricing and availability.

The bottom line

Our top choice

Generac Next Generation 22kW Standby Generator
#1 Best overall

Generac Next Generation 22kW Standby Generator

The 22kW package is the most convincing starting point for a typical whole-home project: meaningful HVAC and appliance capacity without automatically paying for the largest enclosure in the lineup. A licensed installer still needs to validate the load and fuel plan.

  • 22kW LP / 21kW natural-gas output
  • 200A automatic transfer switch included
  • Cellular Mobile Link monitoring built in
9.8Exceptional
242 reviews
Visit Lowe's
Buyer's guide

How to size a whole-home standby generator

A standby generator is a permanently installed system, not a large portable generator. The right size comes from a load calculation, fuel-delivery plan, transfer equipment and local installation requirements working together.

01

Start with a professional load calculation

Square footage is not enough. An installer should inventory HVAC compressors, well and sump pumps, electric heat, water heating, cooking, EV charging and other simultaneous loads—including motor-starting demand.

02

Decide what must run together

Whole-panel transfer does not always mean every appliance can run at once. Load-management modules can temporarily shed lower-priority equipment, often making an 18 or 22kW system a better value than oversizing the generator.

03

Verify fuel and site requirements

Natural-gas meter capacity, pipe sizing, propane tank capacity, setbacks, noise rules, permits and the equipment pad can all change the project. Confirm them before ordering the generator, not after delivery.

04

Budget beyond the equipment

The listed generator price is only one part of the job. Electrical work, gas or propane work, permits, site preparation, delivery, batteries, accessories and ongoing maintenance can materially increase total installed cost.

Safety comes before the score

Read the manufacturer's manual, use the correct protective equipment and follow all local codes. Product rankings are buying guidance, not a substitute for operating instructions.