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So what does a Generac generator actually cost? The short answer: it depends almost entirely on which of the two product families you mean. A portable Generac GP model typically runs $400 to $1,500 at retail. A permanently installed Guardian whole house unit usually lands between $7,000 and $15,000 all-in, equipment and installation together. Those are ranges, not quotes - but they bracket almost every real purchase, and the details below explain where your project will fall inside them.
Generac dominates the home standby market in the US, so pricing is unusually well documented. That cuts both ways: the dealer network is deep, but quotes also vary by region because installation labor, permits, and gas line work are local costs. Here is the full breakdown.
How much does a Generac generator cost by product family
Generac sells generators in three tiers, and the price gaps between them are wide.
Portable generators (GP and iQ series). These are the gas-powered wheeled units and small inverter boxes sold at big-box stores. Small GP models in the 3,000-watt class often start around $400 to $600. Mid-size 7,500-watt units sit in the $900 to $1,300 band, and the dual-fuel and electric-start versions push toward $1,500. Current portable pricing moves around, so check live listings across the portable generator range before budgeting. If you just need to keep a fridge, some lamps, and a phone charged through an outage, this is the cheapest entry point - our standby vs portable comparison covers the trade-offs.
Home standby generators (Guardian series). Air-cooled Guardian units from 9 to 26 kW typically price between $5,000 and $9,000 for the equipment alone, before installation. These run on natural gas or propane, start automatically, and power your whole panel. The Generac whole house generators guide walks each model in the lineup.
Liquid-cooled and larger units. Above roughly 26 kW, Generac switches to liquid-cooled engines built for big homes and small businesses. These commonly run $12,000 to $25,000 or more installed, and most residential buyers never need this tier.
Whole house pricing by size
Size drives price more than any feature. Most homes land in one of three bands:
| Size class | Typical equipment price | Common homes for it |
|---|---|---|
| 9-11 kW | $5,000 - $6,500 | Small homes, essentials-only circuits |
| 14-22 kW | $5,500 - $8,000 | Most 1,500-3,000 sq ft homes |
| 24-26 kW | $6,500 - $9,000 | Larger homes, whole-panel coverage |
The 22 kW class is the volume seller because it covers the AC compressor plus most household loads without forcing load-shedding decisions. Our Generac Guardian 26kW review explains when stepping up to the top of the air-cooled line is worth it, and the 18kW model is the budget-conscious pick in the same family. If you're unsure which band your house falls in, run the numbers through the generator size calculator before comparing quotes.
What installation adds to the price
Equipment prices are misleading on their own, because a standby unit is useless until it's installed. A typical whole house Generac installation includes a concrete pad, the automatic transfer switch, a gas line connection, and a permit inspection. Labor and materials for all of that commonly add $2,000 to $5,000, and complicated runs - long gas lines, difficult access, strict local codes - push higher. Our whole house generator installation guide breaks down each line item.
This is also where Generac quotes differ most from the sticker price you see online. Two identical 22 kW projects on opposite ends of the same town can legitimately differ by $2,000 in install labor. Get three quotes and compare what each includes, not just the total.
Ongoing costs after the purchase
The purchase price is not the end of spending. Plan for:
- Maintenance. Standby units want an oil change and inspection annually, typically $300 to $500 per visit. Generac sells service plans that bundle this.
- Fuel. A whole house unit running on natural gas burns continuously during an outage - expect meaningful gas bills during multi-day events. Propane tank refills cost more per running hour.
- Battery replacement. The starting battery is a wear item, usually replaced every 2-3 years for $100 to $300.
None of these are dealbreakers, but they belong in your budget math. The full lifecycle math sits in our whole house generator cost breakdown, which applies to every brand, not just Generac.
Is the cost of a Generac generator worth it
Value depends on what an outage costs you. If you lose refrigerated food, work-from-home income, or sleep every time the grid flickers, a standby unit pays for itself in avoided annoyance over years of ownership. If outages in your area are rare and short, a $600 portable is the honest answer - check your state's outage profile in our power outages by state guide before spending five figures.
One honest caveat: Generac pricing sits in the middle of the market. Kohler units often carry a premium for quieter operation, and Champion undercuts on price with a thinner dealer network. Where Generac wins is availability of parts and technicians - that matters at year seven, not at purchase.
The practical takeaway: expect roughly $400 to $1,500 for a portable Generac, and roughly $7,000 to $15,000 installed for a whole house Guardian. Your real generac generator cost depends on your home's size, your local installation labor, and how much of the house you actually need powered.
FAQ
How much does a Generac generator cost for a whole house?
A Guardian whole house unit typically totals $7,000 to $15,000 with installation included. Equipment alone runs $5,000 to $9,000 for air-cooled models; installation adds the transfer switch, gas connection, pad, and permits.
Why is installation so expensive?
Installation is skilled labor: an electrician wires the transfer switch into your panel, a plumber ties into the gas line, and a permit inspection closes the job. Labor rates and permit fees vary by county, which is why quotes differ so much.
How much is a Generac 22kW generator?
The 22 kW Guardian class typically prices between $5,500 and $8,000 for equipment, and most installed projects land between $8,000 and $12,000 depending on local labor and gas line work.
Are there cheaper alternatives to Generac?
Champion and Briggs and Stratton both undercut Generac on equipment price. The trade-off is usually a thinner service network - worth checking that a local technician covers your area before committing.
