Generac is the leading home standby generator brand with roughly 75% market share. They invented the automatic home standby generator in 1959 and have the largest dealer network in the US. For most homeowners, Generac offers the best combination of price, availability, and support.
Why most homeowners choose Generac:
- ✓Largest dealer network — easier to find local installers and service
- ✓15-25% cheaper than Kohler for equivalent sizes
- ✓Mobile Link — monitor and control your generator from your phone
- ✓10-year warranty when registered (vs 5-year standard)
Generac Guardian Series Prices (2025)
The Guardian series is Generac's most popular residential line. These air-cooled generators are the best value for homes under 3,500 square feet.
| Model | Unit Cost | Installed Cost | Best For |
|---|---|---|---|
| Guardian 10kW | $3,500 - $4,500 | $6,500 - $9,500 | Small homes, essential circuits only |
| Guardian 14kW | $4,500 - $5,500 | $8,000 - $11,000 | Medium homes up to 2,000 sq ft |
| Guardian 16kW | $5,000 - $6,000 | $8,500 - $12,000 | Medium homes with central AC |
| Guardian 18kW | $5,500 - $6,500 | $9,500 - $13,000 | Larger homes, 2,000-2,500 sq ft |
| Guardian 22kWBest Seller | $6,000 - $7,500 | $10,500 - $15,000 | Most popular size. Full-house coverage. |
| Guardian 24kW | $6,500 - $8,000 | $11,500 - $16,000 | Large homes, 3,000+ sq ft |
| Guardian 26kW | $7,500 - $9,000 | $13,000 - $18,000 | Large homes with high demand |
* Installed costs include transfer switch, concrete pad, electrical, gas line, permits, and labor. Actual costs vary by location and installation complexity.
What Size Generac Do You Need?
Get a personalized recommendation based on your home's size and the appliances you want to power.
Try Our Free CalculatorGenerac Protector Series Prices (2025)
The Protector series uses liquid-cooled engines for larger power output and longer runtimes. Best for homes over 4,000 square feet or those needing commercial-grade reliability.
| Model | Unit Cost | Installed Cost | Best For |
|---|---|---|---|
| Protector 25kW | $9,000 - $11,000 | $15,000 - $20,000 | Large homes, dual-fuel option |
| Protector 30kW | $10,000 - $13,000 | $17,000 - $23,000 | Very large homes, 4,000+ sq ft |
| Protector 38kW | $12,000 - $15,000 | $20,000 - $27,000 | Luxury homes, commercial backup |
| Protector 48kW | $15,000 - $20,000 | $25,000 - $35,000 | Estate homes, small businesses |
Generac Installation Cost Breakdown
Installation typically adds $3,000 to $8,000 to the unit cost. Here's what's included:
| Component | Cost Range | Notes |
|---|---|---|
| Transfer switch | $500 - $1,500 | Automatic transfer switch (ATS) is standard with most Generac units |
| Concrete pad | $200 - $500 | Required foundation, typically 3-4 inches thick |
| Electrical work | $1,000 - $3,000 | Connecting to panel, may require 200-amp upgrade |
| Gas line | $500 - $2,000 | Natural gas or propane connection from meter/tank |
| Permits & inspection | $100 - $500 | Required in most jurisdictions |
| Labor | $1,500 - $3,000 | Professional installation, typically 1-2 days |
Pro tip: Always get at least 3 quotes from Generac-authorized dealers. Prices vary significantly between installers, and package deals often include better warranties.
Generac vs Kohler vs Cummins: Price Comparison
How does Generac pricing compare to other major brands? Here's a side-by-side for similar-sized units:
| Size | Generac | Kohler | Cummins |
|---|---|---|---|
| 14kW | $8,000 - $11,000 | $9,500 - $13,000 | $9,000 - $12,000 |
| 20-22kW | $10,500 - $15,000 | $13,000 - $18,000 | $12,000 - $16,000 |
| 24-26kW | $13,000 - $18,000 | $16,000 - $22,000 | N/A (jumps to 30kW) |
* All prices are for fully installed systems. Kohler costs 15-25% more but offers quieter operation. Cummins is priced between the two.
Frequently Asked Questions
Is Generac a good brand?▼
Yes. Generac invented the home standby generator and holds about 75% market share. They offer the widest dealer network, most model options, and competitive pricing. While Kohler may be quieter and Cummins more industrial, Generac provides the best combination of value, availability, and support for most homeowners.
How long do Generac generators last?▼
With proper maintenance, Generac generators last 20-30 years. The engine is typically rated for 3,000+ hours of operation. Most residential users accumulate 50-200 hours per year during outages, meaning the generator will outlast the home's other major systems.
What size Generac do I need?▼
Most homes need 16-24kW. A 2,000 sq ft home with central AC typically needs 18-22kW. The Guardian 22kW is Generac's best-seller because it covers most homes completely. Use our free calculator for a personalized recommendation based on your specific appliances.
Is Generac cheaper than Kohler?▼
Yes, typically 15-25% cheaper for equivalent sizes. A Generac Guardian 22kW runs $10,500-$15,000 installed, while a comparable Kohler 24RCAL costs $13,000-$18,000. Generac's higher volume and larger dealer network allow for more competitive pricing.
Does Generac include installation?▼
No, Generac generator prices are for the unit only. Installation adds $3,000-$8,000 depending on your location and complexity. However, Generac's dealer network often offers package deals. Always get 3+ quotes that include installation.
What is Generac's warranty?▼
Generac offers a 5-year limited warranty standard, extending to 10 years when you register online within 90 days of installation. The warranty covers parts and labor. Extended warranties up to 7 years are available for purchase.
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