OffGrid Compare

Generac Generators

7 models from $5,000 to $25,000 installed

Last updated: March 2026

Generac is the default choice in home standby generators: and for good reason. They invented the category in 1989, own roughly 75% of the North American residential market, and have over 9,200 dealers nationwide. If you ask a neighbor about their generator, it's probably a Generac. That doesn't mean they're perfect. We'll get to that.

The Company

Founded 1959 in Waukesha, Wisconsin. Public (NYSE: GNRC), $4.2 billion in annual revenue. Largest manufacturer of home standby generators in the world.

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Which Generac Is Right for You?

Generac Guardian 10kW

Guardian 10kW

10kW LP / 9kW NG63 dB

$5,000–$8,000 installed

Small homes under 1,500 sq ft, or essentials-only coverage for larger homes.

Generac Guardian 14kW

Guardian 14kW

14kW LP / 14kW NG65 dB

$8,000–$12,000 installed

1,500–2,000 sq ft homes. The first Guardian size that runs central AC.

Generac Guardian 18kW

Guardian 18kW

18kW LP / 17kW NG65 dB

$10,000–$15,000 installed

2,000–2,500 sq ft homes with 3-ton AC and gas heat.

Generac Guardian 22kW

Guardian 22kW

22kW LP / 19.5kW NG67 dB

$12,000–$17,000 installed

2,500–3,500 sq ft homes with central AC. The bestselling home standby in America.

Generac Guardian 24kW

Guardian 24kW

24kW LP / 21kW NG67 dB

$13,000–$18,000 installed

Larger homes (3,000–3,500 sq ft), or NG homes wanting closer to true 22kW performance.

Generac Guardian 26kW

Guardian 26kW

26kW LP / 22.5kW NG67 dB

$14,000–$20,000 installed

3,500+ sq ft homes with heavy electrical loads. No-compromise whole-house coverage.

Generac Guardian 28kW

Guardian 28kW

28kW LP / 25kW NG67 dB

$16,000–$25,000 installed

4,000+ sq ft homes. Largest residential air-cooled from any brand.

Warranty

5-year limited (parts, labor, travel) with a 2,000-hour cap. Extended options: 5-year extension (~$495) or 10-year total (~$1,000). Must purchase within 12 months of install. Annual professional maintenance required.

Monitoring

WiFi Mobile Link included on every model at no cost. Shows status, alerts, exercise history, outage log. Common complaints: WiFi connectivity drops when generator is far from router. Cellular models ($200–$400 premium) fix this. Notification delays of 1–10 hours reported.

Pros & Cons

What Generac does well

  • ✓Widest selection: 7 residential sizes from 10–28kW. No other brand covers this range in air-cooled.
  • ✓Largest dealer network: 9,200+ dealers means easy service access anywhere.
  • ✓Most affordable per kW at comparable sizes.
  • ✓Available everywhere. Home Depot, Lowe's, Costco, Amazon, plus thousands of dealers.
  • ✓Free Mobile Link monitoring on every model.

Where Generac falls short

  • ✗Reliability complaints: some owners report failures during actual outages.
  • ✗Customer service: owners have reported long hold times and warranty claim friction (rated 1.6/5 on PissedConsumer).
  • ✗Some owners of 2021–2024 22/24kW models have reported alternator issues. A class action has been reported but its current status is unverified.
  • ✗Mobile Link WiFi connectivity issues and notification delays.

Frequently Asked Questions

Is Generac a good generator brand?▾
Yes, Generac is the most practical choice for most buyers — widest selection (7 sizes), most dealers (9,200+), and lowest prices. That's why it ends up in roughly 3 out of 4 homes. Where customers have reported it can fall short: customer service wait times and warranty claim handling (1.6/5 on PissedConsumer). The product itself is solid; the support experience is where complaints concentrate.
How much does a Generac generator cost installed?▾
$5,000–$25,000 depending on size and region. The most popular 22kW model runs $12,000–$17,000 fully installed including the transfer switch, concrete pad, permits, and gas line.
What size Generac do I need for my house?▾
For most 2,000–3,000 sq ft homes with central AC and gas heat, the 22kW is the right call. Smaller homes or essentials-only: 10–14kW. Homes over 3,500 sq ft or with multiple AC zones: 24–28kW.
What is the most popular Generac generator?▾
The Guardian 22kW. It hits the sweet spot of price, power, and coverage for the average American home: central AC, kitchen, lights, home office, all running simultaneously.
Generac vs Kohler: which is better?▾
Generac offers more sizes, a bigger dealer network, and lower prices. Kohler offers premium build quality and a current free 10-year warranty promotion. Choose Generac for selection and value. Choose Kohler if you want heavier construction and don't mind paying 15–20% more.

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Sources & Citations

Claim / StatisticSource
Generac ~75% North American residential standby market shareinvesting.com(accessed 2025-03)
Generac dealer network (9,200+)generac.com(accessed 2025-03)
Generac owner reviews (1.6/5 from 130+ reviews)pissedconsumer.com(accessed 2025-03)
Generac 22/24kW alternator issues (reported, class action status unverified)topclassactions.com(accessed 2025-03)
PissedConsumer generator brand reviewspissedconsumer.com(accessed 2025-03)
ConsumerAffairs generator reviewsconsumeraffairs.com(accessed 2025-03)
U.S. Energy Information Administration (fuel costs)eia.gov(accessed 2025-03)

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