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Avatar for Holistiq Building Systems and Services LLC
Holistiq Building Systems and Services LLC
5.0(
8
)
Fixed Generator - Install

Serving Gretna, VA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Credit card accepted

"I would like to recommend Joshua Smith as a Tesla installer and overall electrician. He did a great job for my wife and I on the installation of our powerwall 3 and car chargers within our garages as well as trouble shooting some other electrical problems at our new home at Smith Mountain Lake. Additionally, he answers phone calls and shows up on time. Again, we highly recommend Joshua."
Response time5 hrs
10 neighbors recently requested a quote
Avatar for Red Clay Mechanical LLC
Red Clay Mechanical LLC
5.0(
3
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+3 more

Serving Gretna, VA and surrounding areas

Approved

Free estimates

Small jobs welcome

Credit card accepted

"I had an excellent experience working with this company from start to finish. The team was professional, responsive, and truly cared about providing quality service. They communicated clearly throughout the entire process and made everything stress-free and easy to understand. What stood out most was their attention to detail and dedication to customer satisfaction. It’s hard to find businesses these days that genuinely go above and beyond, but this company absolutely did. The work was completed on time, exceeded my expectations, and the quality was outstanding! I highly recommend this company to anyone looking for reliable, honest, and professional service. I will definitely be using them again in the future!"
Mounted 75" TV
Handyman Projects
Handyman Projects
Handyman Projects
Handyman Projects

+8

5 neighbors recently requested a quote
Avatar for Jordan Home Maintenance
Jordan Home Maintenance
5.0(
2
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Gretna, VA and surrounding areas

In business since 1993

Free estimates

Emergency services offered

"Barry mows and blows our lawn about weekly.  On occasion I have asked him to plant a few things, remove some walkway bricks to the basement door area.  He is always cheerful and willing to help.  He has won the business of several of my neighbors.
"
Recommended by100%of homeowners
Avatar for The Home Depot - Generators
The Home Depot - Generators
2.5(
1
)
Fixed Generator - Install

Serving Gretna, VA and surrounding areas

In business since 2003

Free estimates

Small jobs welcome

Today, we're proud to be the world's largest home improvement retailer. In 2,300 stores across North America, we aspire to excel in service – to our customers, associates, communities and shareholders. That's what leadership means to us. That's The Home Depot difference.

Generators
Generators
Generators
Generator
Generators

+5

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Generator Install questions, answered by experts

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

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.

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. 

Energy output depends on turbine size, average wind speed at your site, and system efficiency. A 5 kW turbine in a good wind location can generate 8,000 to 12,000 kilowatt-hours per year, which may cover a large portion of an average home’s needs. Accurate output estimates require a professional wind assessment and a review of your household’s energy usage patterns.

Costs depend on generator type, labor, and additional wiring or transfer switch requirements.

The Gretna, VA homeowners’ guide to generator installs

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