Get matched with top generator install pros in Thomson, IL

Q: How big of a generator do I need for a transfer switch?

• <div><p>You can determine what size generator you need for a transfer switch by matching the switch to the largest outlet on your generator. Larger generators can power up to 10 circuits, while most 5,000-watt generators can provide power to six circuits. So, if your generator&rsquo;s largest outlet is 30 amps, you&rsquo;ll need a 30-amp transfer switch.</p></div>

Q: Can I use a generator to charge a back-up battery?

• <div><p>Yes. You can connect your home back-up battery to a generator with its designated charger. Be sure that the output of the generator matches the input requirements for the battery for best results.</p></div>

Q: How does a generator transfer switch save me money?

• <div><p>It might seem counterintuitive, but installing a generator transfer switch will save you money in the long run. While you&rsquo;ll have to pay between <b>$400 and $2,500</b> to have the transfer switch installed, you&rsquo;ll recoup that amount later on when you don&rsquo;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 <a href="https://www.angi.com/articles/how-to-hook-up-generator-to-house.htm">hook up of a generator to your home</a>. </p></div>

Q: What happens if my whole-house generator is too small for my AC?

• <div><p>An undersized whole-house generator has the potential to overheat and shut down when you try to run a central AC system. This scenario can not only damage the whole-house generator, but can also trip your home&rsquo;s breakers or cause electrical damage. To avoid this situation, hire a local generator installer to correctly size your whole-house generator.</p></div>

Q: Do I need a permit to install a portable generator?

• <div><p>You may need a permit for a portable generator if you&rsquo;ll be installing a transfer switch for your primary residence or similar work. Otherwise, a permit for other uses may not be necessary. Check your local building codes or ask a local generator installer for more information about your local regulations.</p></div>

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Verified Reviews for Generator Install pros in Thomson, IL

*The Angi rating for Generator Install companies in Thomson, IL 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 Thomson, IL 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 March 05, 2026

Reviewed in March 2026
Would highly recommend this company we needed our living room completely gutted and re-insulated due to the weather during the winter they came in and removed our whole living room installed new wiring and recessed lights and insulation in a timely manner and very professional. We will be having...
Weigant Home Improvement
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Reviewed in April 2025
Installation of 2 garage doors. Prompt and eager to start and finish the job. Very Satisfied with the job and would recommend and did recommend him for future jobs.
Handy and Dandy Duo, LLC
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Reviewed in August 2024
Although some details of the project prior to the installation varied from reality, the installation team was fast and efficient despite record heat on the day of the work. The job was completed in one day.
1-800-HANSONS (Quad Cities)
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Reviewed in June 2023
The install crew was professional and did a great job.
LeafFilter Gutter Protection
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Reviewed in March 2023
Great experience with GT Electrical! They came out to install my Tesla charging station. EÃ±very professional and reasonable prices. Will hire again.
GT Electrical Contractors Inc.
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Reviewed in January 2023
Great craftsmanship with cabinets and crown molding install. Our cabinet addition and the creative way the shelves which connect them were installed (Thx, Ed!) really make the dining room pop! Showed up on time and left the project area spotless.
ALA Cabinets, LLC
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Reviewed in April 2022
demo and install done in less than 6 hours when the big day finally arrived
Mad City Windows & Baths
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Reviewed in November 2021
The guys that installed my walk in shower were polite and very professional. They explained everything clearly and cleaned up after themselves when they were finished. Would hire them for other projects.
Bath Planet of Quad Cities
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Reviewed in October 2021
Great experience. Mark installed a reverse osmosis system for us. He is knowledgeable, thorough and personable. Scheduling was smooth and prompt. Mark provided superior customer service and follow up.
Chicago Water Pros
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Reviewed in May 2021
Overall, great service. Quick install. Only complaint was the cleanup afterwards. Several cover pieces were left behind in the yard. These are very sharp and hazardous.
S&J Gutter Protection and Services
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Find Generator install pros in Thomson

Tri-State Water, Power & Air

5.0(

)

Serving Thomson, IL and surrounding areas

Approved (Corporate)

In business since 1992

Free estimates

Emergency services offered

We are the experts in the field of Whole Home Generator Sales and Installation, with over 20 years of experience in the game.\nWe provide turn-key installation by licensed professionals - 24 hour emergency service - Remote Monitoring - Long term maintenance and service by factory trained technicians.

41 neighbors recently requested a quote

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The Electric Guys LLC

5.0(

)

Serving Thomson, IL and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"I first asked for a quote back in February of 2024. When I received the quote I decided to wait on this project. Then we lost power for 2 days due to a storm. I then decided it was time and contacted the contractor again. He sent me an updated quote and the project was scheduled. It's now installed and I'm very happy with how it turned out. Hopefully it will be a long time before we need to use the generator because we lose our power. But we are ready when it happens. I will definitely use this company again for any electrical jobs that come up. Andrew and his crew were great."

Response time1 day

Recommended by100%of homeowners

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Mid America Lightning Protection

4.5(

)

Serving Thomson, IL and surrounding areas

Approved

In business since 1969

Free estimates

Emergency services offered

"Responsive, fair pricing. Quality of installation could have been done a little better as rods were slightly crooked and they did not pull the wiring tout on top of house so not totally parallel to roof line."

+70

Response time6 hrs

Response rate94%

3 neighbors recently requested a quote

Serving Thomson, IL and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"Joe, Mark, and Their Team did a Splendid Job for Us on this Business Phone Line Install. There are Very Knowledgeable and provided the Needed Assessment and "Fix" in a Very Timely Manner. I Highly Recommend Accent Tel USA! God Bless You! Philippians 1:3-6! Have a Wonderful Day in the Neighborhood & "Stay on the Nice List"! :)"

Response time3 hrs

Response rate99%

5 neighbors recently requested a quote

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AOM Remodeling and Restoration

4.6(

)

Serving Thomson, IL and surrounding areas

In business since 2012

Free estimates

Emergency services offered

"Based on our past experience with AOM (interior painting), we used them to powerwash our home. They had all the appropriate equipment and did an excellent job. Our 20 year old vinyl siding looks totally refreshed. David is easy to work with and goes the extra mile. We will continue to AOM for future projects.
"

Recommended by90%of homeowners

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Lightning Defense, LLC (Illinois)

4.6(

136

)

Serving Thomson, IL and surrounding areas

In business since 1972

Free estimates

Emergency services offered

"John Sherlock and his wife are the consummate professionals! I would highly recommend them. Their attention to detail and installation quality, was superb. Johns knowledge of Lighting protection is apparent after 40+ years. You will not be disappointed . July 2020. D.Riggio Carterville, Illinois"

+13

Response time4 hrs

Recommended by100%of homeowners

Serving Thomson, IL and surrounding areas

In business since 2023

Free estimates

Credit card accepted

"Zoran is an exceptional electrician and a very honest man. We are extremely satisfied with the work done in our house. We recommend him highly. John A. Damianos"

Response time11 hrs

Recommended by100%of homeowners

Serving Thomson, IL and surrounding areas

In business since 2008

Emergency services offered

Credit card accepted

"They were informative! It's a family business that is generational in their craft. They explained my unit to me and gave me tips to improve it's care. I will be using them in the future for maintenance."

Recommended by82%of homeowners

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Abe Miller Construction LLC

5.0(

)

Serving Thomson, IL and surrounding areas

In business since 2021

Free estimates

Emergency services offered

"Fast response from Abe Miller Construction. The company showed up on time and looked at the project in person. Shortly after the meeting I received I detailed estimates outlining the work to be completed and a full cost breakdown. The remodel got completed quickly. I highly recommend Abe Miller Construction for all of your construction needs!"

Response time30 mins

Serving Thomson, IL and surrounding areas

In business since 1977

Emergency services offered

". John and his wife arrived on the time we scheduled, the job was not big and was completed in just 2.5 hours with professionalism. We are pleased to have the system installed, and sleep better we have added this protection to our home.
"

Recommended by100%of homeowners

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Showing 1-10 of 46

Generator Install questions, answered by experts

You can determine what size generator you need for a transfer switch by matching the switch to the largest outlet on your generator. Larger generators can power up to 10 circuits, while most 5,000-watt generators can provide power to six circuits. So, if your generator’s largest outlet is 30 amps, you’ll need a 30-amp transfer switch.

Yes. You can connect your home back-up battery to a generator with its designated charger. Be sure that the output of the generator matches the input requirements for the battery for best results.

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.

An undersized whole-house generator has the potential to overheat and shut down when you try to run a central AC system. This scenario can not only damage the whole-house generator, but can also trip your home’s breakers or cause electrical damage. To avoid this situation, hire a local generator installer to correctly size your whole-house generator.

You may need a permit for a portable generator if you’ll be installing a transfer switch for your primary residence or similar work. Otherwise, a permit for other uses may not be necessary. Check your local building codes or ask a local generator installer for more information about your local regulations.

The Thomson, IL homeowners’ guide to generator installs

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

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