Top-rated generator install pros.

Get matched with top generator install pros in Windham, NH

Enter your zip and get matched with up to 5 pros

Need a pro for your generator install project in Windham, NH?

Select your specific project to find the pro for you.

TRUSTED BY WINDHAM, NH HOMEOWNERS

  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon49
    Verified generator installs reviews

Verified Reviews for Generator Install pros in Windham, NH

*The Angi rating for Generator Install companies in Windham, NH 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 Windham, NH 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 May 27, 2026

Find Generator install pros in Windham

Avatar for Generator Supercenter of New Hampshire
Generator Supercenter of New Hampshire
5.0(
15
)

Serving Windham, NH and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"Everyone should buy a generator from the Generator Supercenter of NH. Everything was seamless, from the sales visit to the installation. Their professional crews exceeded all expectations. I would highly recommend them."
Completed 22kW Generac Standby Home Generator Installation - With GenMon MobileLink installed, our 24/7 monitoring program which includes annual maintenance!
Automatic Transfer Switch Installed - shown on the left with the customers electrical panel on the right.
Additional Photos
Additional Photos
Additional Photos

+5

Response time5 days
2 neighbors recently requested a quote
Recommended by66%of homeowners
Request Quote
Avatar for ARETE ELECTRIC
ARETE ELECTRIC
5.0(
20
)

Serving Windham, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2012

Free estimates

Credit card accepted

"Tommy and his crew did exceptional work. Very clean, very efficient, and perfect install."
Response time3 days
7 neighbors recently requested a quote
Recommended by5%of homeowners
Request Quote
Avatar for Krafton Electric, LLC
Krafton Electric, LLC
4.6(
120
)

Serving Windham, NH and surrounding areas

Approved

In business since 1990

Free estimates

Customers say: True professional

"I have to say that David Krafton is an excellent electrician. I. Called him about a. light. Over. My sink that I could not fix by replacing the bulbs. He came out and told. Me the light was not working, as it was shorted out. He then went and bought me a new light and installed it. It works get and is so much brighter the the previous one. Thank you David I will be calling you again to do other work for me. Loraine in Bedford N.H."
kitchen renovation
kitchen renovation
existing 100 amp service panel
old and existing circuit breaker electrical panel
existing

+5

Response time1 day
2 neighbors recently requested a quote
Recommended by96%of homeowners
Request Quote
Avatar for The Speedy Sparky LLC
The Speedy Sparky LLC
5.0(
8
)

Serving Windham, NH and surrounding areas

Approved

In business since 2023

Free estimates

Warranties offered

With over 10 years of experience, we pride our company on our quality of work. We are owner operated, and believe in building long-term relationships with our clients by delivering tasks that are accomplished in a neat and workman like manner. Give us a call today. We look forward to working with you!

Camper outlet & breakers
Camper outlet & breakers
Response time11 hrs
Response rate90%
1 neighbors recently requested a quote
Request Quote
Avatar for IDEAL ELECTRICAL SERVICES LLC
IDEAL ELECTRICAL SERVICES LLC
5.0(
11
)

Serving Windham, NH and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"Jon as very professional took his time and enolain what was needed to get the job done. If I had to rate himA+ I would want him to work at my house again"
Service upgrade
Ev charger
Adu new construction
Adu new construction
Lighting upgrades

+8

3 neighbors recently requested a quote
Request Quote
Avatar for Electrical & Security Solutions, LLC
Electrical & Security Solutions, LLC
5.0(
10
)

Serving Windham, NH and surrounding areas

Approved

In business since 2018

Free estimates

Credit card accepted

"Electrical & Security Solutions are the best! I have needed their services more than once to replace lights, a ceiling fan and also to install a new electrical box and breaker for our garbage disposal. Tyler promptly responded every time I called and he and Casey are both friendly, efficient and skillful. Aside from the excellent service, the qualities I appreciate the most is honesty for what work needs to be done and how Tyler is also very budget consciousness."
Landscape lighting
Landscape lighting
Landscape lighting
Landscape lighting
Landscape lighting

+10

Response time4 hrs
10 neighbors recently requested a quote
Recommended by100%of homeowners
Request Quote
...
Showing 1-10 of 115
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.

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.

Yes, natural gas generators can work without electricity. Natural gas generators are a common type of backup or whole-house generator that operates when the electrical grid isn’t working. The trick is using a transfer switch (which usually needs to be installed with the generator) that safely switches the home electrical system from the power grid to generator power when needed.

Generators run on a variety of fuel types, ranging from natural gas to solar power. Keep in mind that fuel costs varying by type:

  • Natural gas: $2,000–$21,000 per year 

  • Liquid propane: $2,000–$21,000 per year

  • Diesel: $3,000–$20,000 per year

  • Gasoline: $500–$3,000 per year

  • Solar generator: $2,000–$25,000 per unit

  • Battery backup: $10,000–$25,000 per unit

The cost to install a whole-house generator averages $5,200, with a typical price range of $1,500 to $8,900. However, total costs can vary from $400 for a small portable unit to over $18,000 for a large-capacity system. The most significant cost factor is the generator's size and capacity, but other variables include the brand, fuel type, and labor for assembly and installation.

Generator costs can be broken down by type:

  • Portable or Emergency Backup Generators (1kW–7.5kW): $500 to $2,000

  • Partial-Home Generators (9kW–20kW): $2,000 to $6,500

  • Whole-House Generators (22kW–48kW): $5,000 to $18,000

To avoid paying for more power than you need, consider hiring an electrician to calculate the electrical load for your essential appliances. It is also recommended to get at least three quotes to find the best deal for your specific needs and budget.

The Windham, NH 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