How Much Does It Cost to Install a Generac Whole House Generator? (Updated Prices)

Installing a Generac whole-house generator involves various factors that contribute to the overall cost. To gain a comprehensive understanding, we’ll explore key elements, considerations, and factors that impact the total expense of this essential home backup power solution.

How Much Does It Cost to Install a Generac Whole House Generator?

Generac whole-house generator installation expenses vary, typically ranging from $3,100 as a starting point, with costs increasing based on unit type. Branded Generac generators, excluding installation, fall between $2,100 and $5,200. 

Total home generator costs range from a minimum of $3,200 to a maximum of $6,300, covering various factors and configurations.

What is a Generac Whole House Generator and How Does It Work?

A Generac whole-house generator is a standby power system designed to provide uninterrupted electricity to an entire home during power outages. It operates automatically, monitoring your home’s power supply. 

When an outage is detected, it swiftly activates, using an internal combustion engine, usually fueled by natural gas or propane, to generate electricity. This electricity is then routed through a transfer switch, seamlessly restoring power to your home’s electrical system. 

generac generator installed

Once grid power is restored, the generator turns off automatically. This ensures uninterrupted comfort and security during blackouts.

Different Cost-Related Factors in Installing a Generac Whole House Generator

When considering the installation of a Generac whole-house generator, it’s essential to delve into the various cost-related factors that can impact the overall expenses. 

While the convenience and peace of mind it offers during power outages are invaluable, understanding the breakdown of costs is crucial for homeowners planning to invest in this backup power solution.

Generator Unit Cost

The most apparent expense associated with a Generac whole-house generator is the cost of the generator unit itself. These generators come in various sizes and capacities to accommodate different power needs. 

Smaller units designed to power essential circuits come at a lower cost, while larger units capable of supplying electricity to an entire home can be more expensive. The type of generator you choose, its brand, and its power output capacity all influence the unit cost. 

generac guardian 22kw generator

Prices can range from $2,100 for basic models to $5,200 for more robust units, without including installation costs.

Professional Installation

Installing a Generac whole-house generator is not a DIY project. Professional installation is a must to ensure the system functions reliably and safely. Installation costs are a significant portion of the overall expense and can vary depending on factors such as the complexity of the installation, local labor rates, and the need for additional components like concrete pads or fuel lines. 

Typically, installation costs start at around $3,100 but can increase based on the specific requirements of your home and the unit’s size.

Electrical and Fuel Connections

To function effectively, a Generac generator needs to be connected to your home’s electrical system and a fuel source. The cost of these connections can vary based on the complexity of your existing electrical setup and the distance between the generator and the fuel source. 


If significant electrical work or gas line extensions are needed, this can add to the overall installation cost.

Fuel Type

Generac whole-house generators are typically fueled by natural gas or propane. The choice of fuel can impact both the installation and operational costs. Natural gas is often more convenient and cost-effective, especially if you already have a gas line in your home. 

Propane, on the other hand, may require the installation of a propane tank, which can add to the upfront cost. Additionally, the ongoing cost of fuel will vary based on your local fuel prices.

Transfer Switches and Accessories

A transfer switch is a crucial component of a standby generator system. It automatically switches your home’s electrical load from the grid to the generator during an outage. The type and size of the transfer switch, as well as any additional accessories or monitoring systems you choose, can affect the overall cost. 

High-capacity transfer switches or smart monitoring features may come with an added price tag.

Maintenance and Warranty

While not an upfront cost, it’s essential to consider ongoing maintenance expenses and the generator’s warranty coverage. Generac generators require periodic maintenance to ensure they function correctly during power outages. 

electricians working on generac 22kw generator

This includes oil changes, filter replacements, and regular inspections. Warranty coverage can vary, so understanding the terms and conditions of the warranty can help you anticipate future costs.

Local Permits and Regulations

Before installing a Generac whole-house generator, you may need to obtain permits from your local authorities. Permit costs and requirements vary by location, and it’s essential to factor them into your budget. 

Additionally, compliance with local building codes and regulations may necessitate specific installation practices that can influence costs.

Site Preparation

The location where the generator will be installed may require site preparation. This can include leveling the ground, pouring a concrete pad, or ensuring proper ventilation for the generator. 

Site preparation costs depend on your home’s specific needs and the condition of the installation site.

Geographic Location

The geographic location of your home can also play a role in the overall cost of installing a Generac whole-house generator. Areas with harsh weather conditions or frequent power outages may require additional features or measures to ensure the generator’s reliability, potentially increasing costs.

installing generac generator

Optional Features and Upgrades

Generac offers various optional features and upgrades that can enhance the performance and convenience of your generator system. These can include remote monitoring, cold weather kits, and load-shedding capabilities. 

While these features can improve the functionality of your generator, they will also contribute to the total cost.

Why Choose Generac Generator Installation for Your Property?

When it comes to securing a reliable source of backup power for your property, Generac generator installation emerges as a compelling choice. With a legacy of innovation and a solid reputation in the industry, Generac has become a preferred brand for homeowners seeking peace of mind during power outages. 

Below are the compelling reasons why choosing Generac generator installation for your property is a wise decision.

Proven Reliability and Performance

Generac generators are renowned for their consistent performance and reliability. With decades of experience in the field, Generac has fine-tuned its generator technology to ensure seamless operation during power disruptions. 

generac generator

Whether a brief outage or an extended blackout, Generac generators are designed to kick into action swiftly, providing your home with continuous power to keep lights on, appliances running, and essential systems operational.

Extensive Range of Options

Generac offers a diverse range of generator options to suit different property sizes and power needs. From compact models capable of powering essential circuits to whole-house generators that can maintain your entire home’s electricity supply, Generac has a solution for every requirement. 

This versatility allows homeowners to tailor their backup power system to meet their specific needs, ensuring no disruption in comfort and security during outages.

Automatic Operation and Hands-Free Convenience

One of the standout features of Generac generators is their automatic operation. These systems are equipped with advanced monitoring technology that detects power interruptions instantly. 

When an outage occurs, the generator activates automatically, seamlessly transitioning your home from grid to generator power. This hands-free convenience ensures that you don’t need to be present or awake to initiate backup power, making Generac generators an ideal choice for uninterrupted protection.

Fuel Flexibility

Generac generators can be powered by either natural gas or propane, providing flexibility and convenience to homeowners. If your property already has a natural gas connection, you can tap into this existing resource for generator fuel. 

generac generator properly installed

Alternatively, propane tanks can be installed to fuel the generator. This versatility allows you to choose the fuel source that best aligns with your preferences and existing infrastructure.

Expert Installation and Support

Generac takes pride in its extensive network of certified dealers and installers. When you opt for Generac generator installation, you benefit from the expertise of professionals who are well-versed in the intricacies of Generac systems. 

They ensure that the generator is correctly installed, integrated with your home’s electrical system, and compliant with local codes and regulations. Furthermore, Generac’s customer support and maintenance services offer peace of mind, as they provide ongoing assistance and routine maintenance to keep your generator in optimal condition.

Cost-Effective Solution

While investing in a Generac generator involves an upfront cost, it can prove to be a cost-effective solution in the long run. The ability to maintain essential functions like heating, cooling, refrigeration, and security systems during power outages can prevent costly damage and inconvenience. 

Additionally, the enhanced resale value of homes with backup generators can offset the initial investment.

Load Management and Efficiency

Generac offers load management options that allow you to prioritize which circuits receive power during an outage. This feature helps optimize generator performance, ensuring that essential appliances and systems are powered while minimizing unnecessary load. 


By distributing power efficiently, Generac generators can extend the runtime on a single tank of fuel, enhancing their overall efficiency.

Smart Technology Integration

Generac is continually innovating and integrating smart technology into its generators. With the Mobile Link™ Remote Monitoring system, homeowners can remotely monitor their generator’s status, receive maintenance alerts, and even start or stop the generator using a smartphone or computer. This level of control and accessibility enhances convenience and peace of mind.

Resilience in Extreme Weather

Generac generators are built to withstand harsh weather conditions. Whether you live in an area prone to hurricanes, snowstorms, or severe thunderstorms, Generac generators are designed to operate reliably, ensuring your power stays on when you need it most. This resilience is a crucial factor in regions where power outages are a frequent occurrence.

Industry-Leading Warranty

Generac stands behind the quality and durability of its products by offering industry-leading warranties. Depending on the model and configuration, Generac generators come with warranties that can extend up to 10 years. 

generac generator

This level of warranty coverage provides homeowners with added confidence in their investment and reassurance that Generac is committed to product longevity and performance.

How Big Generator Do You Need?

Choosing the appropriate generator size is crucial to ensure that your backup power system meets your specific requirements. To determine how big of a generator you need, consider the following factors:

  • Total Load Requirements. Start by making a list of all the essential appliances, lights, and systems you want to power during an outage. Calculate their combined wattage to determine your total load.
  • Essential Versus Non-Essential Loads. Differentiate between essential loads (e.g., refrigeration, heating, security systems) and non-essential loads (e.g., entertainment systems, decorative lighting). Prioritize essential loads for backup power.
  • Generator Sizing Guide. Consult a generator sizing guide or calculator provided by generator manufacturers. Input your total load requirements, and the tool will recommend an appropriate generator size in kilowatts (kW) [1].
  • Consider Future Needs. Think about potential future additions or changes in your electrical needs. It’s often wise to invest in a slightly larger generator to accommodate any expansions.
  • Professional Assessment. Consult a certified electrician or generator installer for a thorough assessment. They can provide expert guidance based on your specific electrical system and requirements.
  • Load Management. If budget constraints are a concern, consider load management options that allow you to prioritize essential loads, which may enable you to choose a smaller generator.

How Long Can a Backup Generator and Portable Models Run Without Stopping?

Manufacturers typically advise running standby generators continuously for up to three weeks or around 500 hours. On the other hand, portable generators, capable of running for 8 to 14 hours on a half-power load with one tank of fuel, shouldn’t ideally operate beyond a continuous 24-hour cycle without a break.

installing generac generator

Portable generators prove useful for short power interruptions but lack the reliability required for extended or indefinite periods of continuous operation. In contrast, Generac generators offer a distinct advantage. 

These units seamlessly connect to your home’s existing systems, providing extended emergency backup in the event of a power outage. The configuration activates automatically when the utility company’s power supply is disrupted and can efficiently power your entire home as long as a fuel source is available. 

This reliability and capability make Generac generators a dependable choice for uninterrupted power during prolonged outages, ensuring your home remains comfortable and secure.

How Much Does It Cost to Run a Generator?

Maintaining installed home generators can indeed incur significant power and fuel costs. For instance, during prolonged power outages, daily fuel expenses may escalate to over $30, which can accumulate to a substantial $3,000 to $15,000 for liquid propane usage.

To economize and make the most of your generator, it’s advisable to employ it as a last resort when no alternative power source is accessible, and grid electricity is entirely unavailable. In such scenarios, operating the generator in test or standby mode, or activating it solely during outages, can dramatically reduce costs to less than $10 per month. 

electricians working on generac 22kw generator

By judiciously managing its usage, you can strike a balance between ensuring your essential power needs are met and minimizing the financial impact of generator operation during extended outages.

What is the Expected Lifespan of a Generator?

The lifespan of a Generac guardian can extend up to two decades when subjected to proper maintenance and standard operating conditions. It’s crucial to preserve this investment by keeping the equipment well-maintained and minimizing frequent use, as neglect and heavy usage can notably shorten its longevity. 

Furthermore, Generac’s automatic units typically come with a limited warranty, with options for extended warranties to provide added protection for your generator. In general, standby generators have an anticipated lifespan ranging from 15 to 30 years, offering between 10,000 to 30,000 hours of reliable operation with regular maintenance.

On the other hand, portable generators tend to last for up to a decade, providing 2,000 to 5,000 hours of power when appropriately maintained. Reputable brands typically include limited warranties for whole-house generators, with durations ranging from 5 to 10 years, depending on the specific model. 

How to Maximize the Lifespan of Your Generator?

Maintaining your generator is essential to ensure its longevity and dependable performance during power outages. Here are key strategies to maximize the lifespan of your generator:

generac generator installed behind house
  • Regular Inspections. Schedule routine visual inspections to check for loose connections, damaged components, or signs of wear and tear.
  • Oil and Filter Changes. Change the generator’s oil and filters at recommended intervals to keep the engine running smoothly.
  • Battery Care. Ensure the generator’s battery is in good condition by testing it regularly and replacing it when needed.
  • Fuel Maintenance. Use clean, stable fuel and consider adding fuel stabilizers to prevent fuel degradation.
  • Exercise the Generator. Run the generator under load for about 15 minutes every month to keep it in working order.
  • Coolant Check. Monitor coolant levels and quality to prevent overheating and engine damage.
  • Keep It Clean. Remove dirt, debris, and dust from the generator and its surroundings to prevent clogs and overheating.
  • Professional Servicing. Schedule professional maintenance by a certified technician at recommended intervals, typically annually.
  • Load Management. Avoid overloading the generator; prioritize essential loads and use load-shedding devices if necessary.
  • Proper Storage. If the generator is not used for an extended period, store it with a full tank of stabilized fuel and disconnect the battery.
  • Follow Manufacturer Guidelines. Adhere to the manufacturer’s maintenance guidelines outlined in the user manual for your specific generator model.


The installation cost of a Generac whole-house generator varies based on multiple factors, such as unit size, fuel type, and installation requirements, but careful consideration of these elements is essential.


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