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Avatar for Holtzclaw Electric
Holtzclaw Electric
4.9(
9
)
Fixed Generator - InstallGenerator - Install - For BusinessGenerator - Repair - For Business+1 more

Serving Herrin, IL and surrounding areas

Approved

In business since 2009

Credit card accepted

Offers commercial services

"Mr. Holtzclaw is an extremely professional, friendly, and HONEST individual. He came to my home and went right to work, explaining to me the work and the issues he confronted all of the way through the process. When he completed the project, he charged a very FAIR price which was lower than I had been quoted by bigger operations for the same work. I highly recommend Holtzclaw Electric."
Response time2 hrs
Recommended by100%of homeowners
Avatar for B & D Construction and Electrical
B & D Construction and Electrical
4.8(
24
)
Portable Generator - Install

Serving Herrin, IL and surrounding areas

Approved

In business since 2016

Free estimates

Emergency services offered

"This was no simple project, it was necessary for several fixtures to be moved and a cabinet to be made to fit. We are a Public Library and are only open a few days a week with specific hours. In addition to this project, he has installed a light fixture in the ceiling, an emergency light, a smoke alarm and added a bookcase. Neil was able to work around our hours and install smoothly without disturbance to patrons inside. The work area remained clean while he was working and he followed through the complete job in a timely manner. He knew what tools he would need and came prepared. I have him on the agenda for more work in the future. The range of his skills allows for the Library to utilize his business for multiple projects in a wide variety of areas. The cost was wonderfully in our budget and he is able to give quotes immediately. Love working with him."
200 amp electrical box
Room Addition
Room Addition
Den addition
Fence Installation

+40

Response time1 day
3 neighbors recently requested a quote
Recommended by72%of homeowners
Avatar for VMK Remodeling
VMK Remodeling
4.2(
19
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+3 more

Serving Herrin, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Warranties offered

"Very pleased with the quality of the kitchen cabinet installation. Company we contacted with for counter tops also commented on the quality of their work. Customer service was excellent. They arrived as scheduled and quickly responded to messages. Work was done well and on time."
Response time5 hrs
Response rate86%
68 neighbors recently requested a quote
Avatar for 618 Electric
618 Electric
5.0(
20
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+3 more

Serving Herrin, IL and surrounding areas

In business since 2017

Free estimates

Emergency services offered

"618 did an excellent job. There were right on time, worked quickly, cleaned up and were very friendly. They seemed knowledgeable about electrical work and were more than fair with cost. They even installed my DirectTV! I love what they did and would most definitely recommend them."
Response time8 hrs
4 neighbors recently requested a quote
Recommended by75%of homeowners
Avatar for Hope Electric
Hope Electric
4.8(
9
)
Portable Generator - Install

Serving Herrin, IL and surrounding areas

In business since 2019

Free estimates

Offers commercial services

"John installed an outdoor generator connection and a lockout on the main panel. A very fair price, good communication and a very professional, quality installation."
Response time1 day
Response rate99%
Recommended by100%of homeowners
Showing 1-10 of 14
Generator Install questions, answered by experts

No, you should never plug a generator directly into a wall outlet in your house. This practice is extremely dangerous, often illegal, and can cause "back-feeding," where power from the generator flows back into utility lines, creating a life-threatening hazard for utility workers. It can also damage your home's electrical system, including appliances like pumps and HVAC fans. If the main power is restored while the generator is connected, it can destroy the generator and cause an electrical fire. To safely connect a generator, you must use a professionally installed transfer switch or an interlocking kit, which prevents back-feeding by disconnecting your home from the utility grid before the generator provides power.

If you have a transfer switch properly installed, the generator and main electrical power cannot feed the system at the same time. However, you should still shut off the power at your main circuit breaker panel before activating the generator. If you do that, you’ll simply need to shut off the generator and reset your circuit breaker once the local power comes back on.

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.

Whole-house generators need to be installed on level ground several feet away from walls and other objects. Because they tap into the electrical system directly, they usually need to be close to your home electrical panel for a transfer switch installation. It also helps with installation if they are near to a gas line or propane tank installation.

Many services include assembling the unit and securing it in the window. Confirm with your provider.

The Herrin, IL homeowners’ guide to generator installs

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