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    Average homeowner rating
  • Verified reviews icon17
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Verified Reviews for Generator Install pros in Grayslake, IL

*The Angi rating for Generator Install companies in Grayslake, 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 Grayslake, 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 June 16, 2025

Find Generator install pros in Grayslake

Avatar for Tri-State Water, Power & Air
Tri-State Water, Power & Air
5.0(
5
)
Fixed Generator - InstallGenerator - InstallGenerator - Install - For Business

Serving Grayslake, 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.

Additional Photos
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Additional Photos

+3

21 neighbors recently requested a quote
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Avatar for Precision Today Plumbing Heating Cooling Electrical
Precision Today Plumbing Heating Cooling Electrical
4.6(
329
)
Fixed Generator - InstallFixed Generator - Repair

Serving Grayslake, IL and surrounding areas

Approved (Corporate)

In business since 1992

Emergency services offered

Warranties offered

"Installer was knowledgeable explained the installation process and different cost/warranty prices. Clean and efficient."
Pipe Coating
Pictures
Pictures
Pictures
Pictures

+13

Response time10 hrs
Response rate100%
30 neighbors recently requested a quote
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Avatar for AGI Lab, Inc.
AGI Lab, Inc.
5.0(
24
)
Fixed Generator - Install

Serving Grayslake, IL and surrounding areas

Approved

In business since 2018

Free estimates

Warranties offered

"Anton is a great and diligent worker. He ran a pipe from my main panel in the basement to my garage. Given the distance and the difficulty of the work he turned a 2 man job into a 1 man job. He was extremely considerate and flexible. I will use him on all of my electrical needs moving forward."
Kitchen and living room
Kitchen
Old electrical panel
New elecrical panel
New electrical panel Siemens

+7

Response time9 hrs
Recommended by100%of homeowners
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Avatar for Your IT Guy
Your IT Guy
4.7(
47
)
Portable Generator - Install

Serving Grayslake, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2002

Free estimates

Warranties offered

"Chuck and Eric came and worked on installing outlets in our basement and replacing an outlet in our patio. Very professional and knowledgeable. Reasonable price would definitely hire them again. A+++"
Response time6 hrs
8 neighbors recently requested a quote
Recommended by78%of homeowners
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Avatar for Imperial electric
Imperial electric
4.8(
19
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install

Serving Grayslake, IL and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"The service guy came out very quickly. Had a smart thermostat installed. He walked me through setting up the app. Did a fast and a great job. I highly recommend this company if you want it done and done right."
17 neighbors recently requested a quote
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Avatar for Four Seasons Heating & Air Conditioning
Four Seasons Heating & Air Conditioning
4.3(
3,297
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Grayslake, IL and surrounding areas

Approved (Corporate)

In business since 1971

Free estimates

Emergency services offered

"Four Season service was awesome. The installers were friendly, professional, and knowledgeable. The installers cleaned up work area after they finished the job."
Additional Photos
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Response time9 hrs
35 neighbors recently requested a quote
Recommended by86%of homeowners
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Avatar for Toptec Heating, Cooling, Plumbing & Electrical, Inc.
Toptec Heating, Cooling, Plumbing & Electrical, Inc.
4.4(
614
)
Fixed Generator - InstallFixed Generator - Repair

Serving Grayslake, IL and surrounding areas

Approved

Super Service Award Winner

In business since 1993

Free estimates

Emergency services offered

"Very professional, friendly, clean and fast. He even fixed some bad plumbing the original installer had put in, without charging or complaining. Price was what he quoted plus a few hoses and valves that had to be replaced. Would definitely hire again."
Duct Cleaning Before/After
Additional Photos
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Barrington Geothermal Lake Heat Exchangers
Barrington Geothermal - WaterFurnace Geothermal Heating/Cooling Systems with Desuperheaters

+48

Response time1 day
Response rate100%
10 neighbors recently requested a quote
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Scardino Electric, Inc.
5.0(
3
)
Generator - Install - For BusinessGenerator - Repair - For Business

Serving Grayslake, IL and surrounding areas

Approved

In business since 1970

Free estimates

Credit card accepted

With over 50 years of business serving the Chicago metro area, Scardino Electric, Inc., is the way to go for all your wiring and panel upgrade needs. We take great pride in our extreme professionalism, timeliness, and superior customer service on every job. We make sure to do excellent work on every visit, answer all questions, and develop lasting relationships with all our clients so, that the next time service is needed, there will be no question on who to call. Contact us today for a free estimate. Satisfaction Guaranteed!

Response time11 hrs
Response rate100%
Recommended by100%of homeowners
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Avatar for Ls industrial repair
Ls industrial repair
5.0(
2
)
Portable Generator - Repair

Serving Grayslake, IL and surrounding areas

Approved

Free estimates

Small jobs welcome

Credit card accepted

At LSI repair we offer only the best and fair prices. We also specialize in heat treating furnaces but we cover a large array of services from residential to commercial from small to big.

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Generator Install questions, answered by experts

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. 

A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.

With proper maintenance, a whole-house generator can last between 20 and 40 years. The specific lifespan depends on how often and for how long the generator is used, and some models may have their life expectancy rated in hours of operation. To maximize its lifespan, expect to spend around $150 to $300 per year for annual maintenance checks from a qualified technician. During these checks, a technician will inspect the engine filter, starting mechanism, fuel, lubrication, and coolant levels. Consulting your installer and choosing a low-impact fuel like natural gas or diesel can also help ensure your generator lasts as long as possible.

While the rating will tell you how many watts the refrigerator needs at the peak of its cycle, it requires additional wattage to start. At the bare minimum, you’ll need a 1,500-watt generator to get the fridge up and running after a blackout. A 2,000-watt generator should be sufficient for most home refrigerators.

Here’s what you can run with different wattages and types of generators:

Portable generator:

  • 2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. 

  • 4,000 watts will keep two large appliances operating and a few smaller devices.

  • 8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.

Partial to whole-house generator:

  • 20,000 watts and above will make it seem like your home’s power is still on.

The Grayslake, IL 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