Expert installation, repair, and replacement for Generac standby generators across Suffolk and Nassau County, backed by 24/7 emergency service.
Domino Fuel installs, repairs, and replaces Generac standby generators across Long Island. Our licensed technicians service every Generac model, size it right for your home, and back every job with a free estimate and 24/7 emergency service.
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Generac is one of the standby generator brands we proudly install and service across Long Island. Our licensed technicians know Generac systems inside and out, from quick repairs to full replacements and upgrades.
Browse all the standby generator brands we carry, or see the rest of our generator services.
Generac is the number-one-selling home standby generator brand in the United States, and its Guardian series is a popular, reliable choice on Long Island. Air-cooled models from 10 to 26 kW run on natural gas or propane and start automatically within seconds of an outage.
Generac standby generator highlights:
Generator price depends mostly on size (kW) and your home's load. Here is roughly what a whole-house standby generator costs, using current national averages.
| Item | Typical installed cost (U.S. average) |
|---|---|
| Whole-house generator, installed | $5,000 - $25,000 |
| Typical total project (avg) | $5,090 - $17,000 |
| Installation (avg, permits/pad/wiring/ATS) | ~$4,520 |
Per Angi and HomeAdvisor (2026): a whole-house standby generator runs about $5,000 to $25,000 installed, averaging roughly $5,090 to $17,000 by size. Installation (permits, pad, wiring, transfer switch) averages about $4,520. Gas-line work and size drive the final price.
Want your exact number? Costs vary by model and your setup, so we never guess. Get a free estimate for your exact Generac standby generator price, with no obligation.
Here is a quick look at the main Generac standby generator models we install and service on Long Island, so you can compare power, fuel, and coverage at a glance.
| Model / Series | Power (kW) | Fuel | Coverage | Best For |
|---|---|---|---|---|
| Guardian 10 kW | 10 kW | Natural gas / propane | Essential circuits | Smaller homes, key circuits |
| Guardian 14-18 kW | 14-18 kW | Natural gas / propane | Most of the home | Typical Long Island homes |
| Guardian 22-24 kW | 22-24 kW | Natural gas / propane | Whole-home (most) | Whole-home backup; 22 kW best-seller |
| Guardian 26 kW | 26 kW | Natural gas / propane | Whole-home, large | Large homes, heavy loads |
Generac Guardian is the #1-selling home standby line in the U.S. All models start automatically on natural gas or propane.
Every Generac standby generator we install starts with a load calculation to size it right, whole-home or essential circuits, then a properly sized gas line, a code-compliant automatic transfer switch, safe placement and clearances, and the permits. The electrical work is done by our licensed team.
When we are done, your generator starts automatically within seconds of an outage and runs a weekly self-test. See our generator installation page.
If your Generac generator fails its self-test, will not start during an outage, surges, or throws an alarm, our technicians diagnose and repair it quickly. We also perform the scheduled maintenance, oil, filters, battery, and a load test, that keeps it ready when you need it.
A generator that is not maintained is the one that fails during a storm. We keep yours storm-ready year round.
When a generator is too small for your loads, hard to get parts for, or beyond economical repair, we make replacement simple. We will run a fresh load calculation and right-size a new Generac unit, reusing your gas and transfer-switch work where we can.
We handle removal, the new install, and permits, with a free estimate up front. See our generator installation page.
Catching these early usually means a smaller, cheaper fix. Call us if your Generac standby generator shows any of the following:
Repair is not always the smart money. It is usually time to replace when you see:
We stock or quickly source the parts that wear out most on Generac standby generators, so repairs and tune-ups stay fast:
Not sure what your standby generator needs? Contact us or call (631) 779-3196 and we will diagnose it for you.
Not sure which brand fits your home? Explore the other standby generator brands we install and service across Long Island.
Common questions about this standby generator brand on Long Island.
Yes. Our licensed technicians repair all Generac standby generators across Suffolk and Nassau County, including 24/7 emergency service.
Yes. We install and replace Generac standby generators, sized for your home and installed to code, with a free estimate up front.
It depends on what you want to power. We run a load calculation, whole-home or essential circuits, and size it right so you do not overspend or overload it.
Yes. Generac and Honeywell standby units run on natural gas or propane and start automatically within seconds of an outage, even when you are away.
Yes. We offer service and maintenance so your generator is tested and ready, which is essential for reliable backup power.
Yes. We offer financing on new standby generator installations on Long Island. Ask about terms when you get your free estimate.
Get a free, no-obligation quote from your local Long Island standby generator experts.
