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VACA ELECTRICAL CONTRACTING & CONSTRUCTION, CORP.
4.8(
31
)
Fixed Generator - Install

Serving Oak Forest, IL and surrounding areas

Approved

In business since 2008

Free estimates

Credit card accepted

We take on a wide range of electrical projects to include full installation for additions and remodels as well as generator installs, wiring and panel upgrades, and a variety of other jobs. We take pride in our quality of work and our commitment to outstanding results. We are committed to providing a personalized service for each individual project we take on. We look forward to building strong, long-term relationships with our clients and guarantee your satisfaction.

1 neighbors recently requested a quote
Recommended by96%of homeowners
CERTIFIED ELECTRIC LLC
5.0(
6
)
Fixed Generator - InstallPortable Generator - Install

Serving Oak Forest, IL and surrounding areas

Approved

In business since 2019

Emergency services offered

Offers commercial services

Certified Electric is a licensed, bonded, and insured electrical contractor dedicated to providing safe, reliable, and high-quality electrical services.\n\nWe specialize in residential electrical work, including panel upgrades and EV charger installations.\n\nOur mission is to deliver honest service, expert craftsmanship, and lasting solutions while treating every customer’s home with the care and professionalism it deserves.\n\nLet’s Make It Happen. ⚡

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+2

Response time1 hour
Response rate89%
4 neighbors recently requested a quote
Avatar for M.T. Kelley Electric LLC
M.T. Kelley Electric LLC
5.0(
4
)
Generator - Install - For Business

Serving Oak Forest, IL and surrounding areas

Approved

In business since 1994

Warranties offered

Credit card accepted

M.T. Kelley Electric LLC\nis a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

Response time8 hrs
Response rate99%
2 neighbors recently requested a quote
Avatar for Mister Sparky of South Chicagoland
Mister Sparky of South Chicagoland
5.0(
5
)
Fixed Generator - Install

Serving Oak Forest, IL and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

Mister Sparky of South Chicagoland proudly serves homeowners throughout the City of Chicago and the surrounding south suburbs. Our team is committed to providing safe, reliable electrical service with exceptional professionalism and attention to detail. Whether you need a quick repair, panel upgrade, lighting installation, or a larger project, we stand behind our work with a customer satisfaction guarantee. For added convenience, financing options are available for qualifying projects. Contact us today — we look forward to earning your business.

2 neighbors recently requested a quote
Avatar for Escudero Electrical Contractors LLC
Escudero Electrical Contractors LLC
5.0(
4
)
Fixed Generator - Install

Serving Oak Forest, IL and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

Escudero Electrical Contractors LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

2 3 Phase Disconnects
Response time3 hrs
Recommended by100%of homeowners
Avatar for Enable Electric
Enable Electric
4.8(
3
)
Fixed Generator - Install

Serving Oak Forest, IL and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

We are a locally owned and operated company. We value honesty and integrity in all aspects of our business. We offer a variety of electrical services that are customized to each individual project. We pride ourselves on the quality of our work, as well as our commitment to outstanding results. We look forward to building lasting relationships with our clients and guarantee your satisfaction!

Response time5 hrs
Recommended by100%of homeowners
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Generator Install questions, answered by experts

Natural gas and electricity rates vary significantly based on location, and pricing can change over time, too. It’s possible that in locations where natural gas is particularly inexpensive, it will cost less than grid-based electricity will. However, you should also factor in the generator’s initial costs and maintenance needs, as well as its noise level and if it can comfortably power all your home appliances.

Sizing a generator is a careful process that requires calculating the electrical load of your entire house. You have to take into account every device you want to use and their wattage requirements, plus the wattage needed to start them, and look for a generator that can safely run all that at around 80% capacity.

In more practical terms, a small home can run on a 10,000-watt generator (and if you only want to power a few key appliances, much less than that). A mid-sized home may need something between 15,000 and 22,000 watts. Larger homes require 25,000 watts or more. 

The average cost to install a home generator is $5,200, but total costs can range from $500 to $18,000 or more. The final price depends on several factors, including the generator's size, type, brand, fuel source, and the cost of labor and assembly. The generator's size is the most significant cost factor, as units that can power larger homes with higher energy demands cost more.

Cost breakdowns by generator type are typically as follows:

  • Portable or Emergency Backup Generators (1kW–7.5kW): $500–$2,000

  • Partial-Home Generators (9kW–20kW): $2,000–$6,500

  • Whole-House Generators (22kW–48kW): $5,000–$18,000

To ensure you get the right size unit for your needs without overpaying, consider hiring an electrician to calculate the electrical load of your essential appliances. It is also recommended to get at least three quotes from qualified installers to find the best fit for your budget.

The amount of time a standby generator can run continuously is around 3,000 hours on average. However, standby generators can generally run indefinitely as long as they have a continuous fuel supply. Generators hooked up to a home’s natural gas supply are the best option for extended usage, as these won’t rely on a finite fuel supply based on how much you have in storage. Generators running on liquid propane or diesel won’t last as long, as these require fuel storage and regular refueling to stay running.

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

The Oak Forest, IL homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.