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Verified Reviews for Generator Install pros in Ontario, CA

*The Angi rating for Generator Install companies in Ontario, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.

*The HomeAdvisor rating for Generator Install companies in Ontario, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.

Last update on December 23, 2025

Find Generator install pros in Ontario

Avatar for Casaroja Electric Inc
Casaroja Electric Inc
5.0(
19
)
Fixed Generator - InstallPortable Generator - Install

Serving Ontario, CA and surrounding areas

Approved

Emergency services offered

Warranties offered

Offers commercial services

"Sergio did a fantastic job! Very happy with the clean install of my tier 2 charger and he added a plug down below my panel. Would recommend for any sort of EV charging installs! Clear communicator, showed up when he said he would and his services were well-priced!"
Panel upgrade
Panel upgrade
Panel upgrade
Panel upgrade
Panel upgrade

+1

5 neighbors recently requested a quote
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Avatar for Direct Electric Company
Direct Electric Company
4.6(
151
)
Fixed Generator - InstallGenerator - Install

Serving Ontario, CA and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"Great! Even installed a switch I bought for the fan at no additional charge."
Tesla Wall Connector installation
Exterior wall light installation
Pendants and small chandelier installation
Recessed can lighting and ceiling fan installation
Electrical Home Improvement

+13

Response time12 hrs
Response rate100%
3 neighbors recently requested a quote
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Avatar for ZERO ELECTRIC
ZERO ELECTRIC
4.9(
10
)
Fixed Generator - InstallGenerator - InstallGenerator - Install - For Business+1 more

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Credit card accepted

"Highly Recommended! We have hired Zero Electric to do several jobs at our apartment complex including installing a generator, EV chargers, new panel, and even installing recessed lighting in the units. They handled all aspects of the projects and had top notch communication throughout. The team has always been quick and professional. We will continue using Zero Electric for our electrical needs."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+1

1 neighbors recently requested a quote
Recommended by70%of homeowners
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Avatar for Accurate Electric, Plumbing, Heating and Air
Accurate Electric, Plumbing, Heating and Air
4.5(
14
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business

Serving Ontario, CA and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"I worked with the owner and the field supervisor - both extremely nice & very professional. I hope I have additional work needed in the future just so that I can work with them again!"
Jeff Seale - Owner
Albert Aragon - Dispatch
Cheri Fortner - Operations Manager
Dan Hartman - Journeyman Plumber
Eric Bribiesca - Comfort Advisor

+23

19 neighbors recently requested a quote
Recommended by81%of homeowners
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Trout Electric
4.3(
20
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+3 more

Serving Ontario, CA and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"They were prompt and reasonable. They were able to re-wire our kitchen and pull extra electric from the electric main. They also cleaned up the electrical panel and replace bad breakers The only issue we had is that some of the outlets were not level and the right depth for the 1/2" drywall that was going to be installed."
Recommended by88%of homeowners
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Avatar for CHAMPION ELECTRIC
CHAMPION ELECTRIC
4.9(
7
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Ontario, CA and surrounding areas

Approved

In business since 1991

Free estimates

Emergency services offered

"Nick was amazing!!! Very informative and professional. I'll trust no one else. Highly recommend."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+14

Response rate100%
1 neighbors recently requested a quote
Recommended by100%of homeowners
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Advance Electric
4.3(
11
)
Portable Generator - InstallPortable Generator - Repair

Serving Ontario, CA and surrounding areas

Approved

In business since 2009

Free estimates

Credit card accepted

"Ricardo is the best electrician I?ve ever hired. Was very professional and friendly to talk to. Honest pricing for a meter panel upgrade. Did what he said he was going to. Also checked out some lighting fixtures I wanted to get installed in my home as I?ve had several quotes and they were just outrageously priced but he gave me the best price out of 6 electricians! Will definitely hire Rick for all my future electrical needs!!"
Response time10 hrs
2 neighbors recently requested a quote
Recommended by50%of homeowners
Request Quote
Avatar for McKee Electrical Contracting
McKee Electrical Contracting
5.0(
2
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Ontario, CA and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"They are knowledgeable and installed the car charging station in my garage. I had compared with other companies who seemed to be cutting corners, and I felt McKee was doing things the right way so I chose them. His communication was good, he was on time, and followed through on what he said he would do. Good, clean, and professional. I intend to have him back out for my next electrical project."
ELECTRICAL Projects
ELECTRICAL Projects
ELECTRICAL Projects
ELECTRICAL Projects
Response time20 mins
Recommended by100%of homeowners
Request Quote
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Showing 1-10 of 198
Generator Install questions, answered by experts

To power a central air system during a power outage, the whole-house generator will need to be at least 5,000 watts, and this number will significantly increase for larger units. Check the specific wattage requirements of your AC unit to choose the right generator size. Consider consulting a generator installer to ensure your whole-house generator meets your electrical load needs.

It might seem counterintuitive, but installing a generator transfer switch will save you money in the long run. While you’ll have to pay between $400 and $2,500 to have the transfer switch installed, you’ll recoup that amount later on when you don’t have to pay for expensive repairs to your appliances, devices, and electrical system that may have burned out, overloaded, or stopped working due to a sudden loss of power or an incorrect hook up of a generator to your home. 

You can expect a diesel generator to last for up to 30,000 hours of use, which works out to 20 to 25 years with the proper maintenance, of course. That depends on how much you use it, so a diesel generator used for emergencies a couple of times a year will last a lot longer than a generator that takes over for a faulty electrical grid every month for a day or two. 

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.

Yes, installing a generator usually increases your property value because buyers are getting the added peace of mind knowing they’ll be able to maintain power through blackouts. In most cases, you should see close to a 100% return on investment (ROI). Keep in mind that home generators usually need a permanent foundation, and installing a concrete slab will likely raise your property taxes slightly.

The Ontario, CA homeowners’ guide to generator installs

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

See all articles