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Top-Rated Generator install pros in Andover - Updated Nov 2026

Avatar for Generator Supercenter of New Hampshire
Generator Supercenter of New Hampshire
4.8(
35
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Andover, NH and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"The installation was performed ahead of schedule and was completed in just a few hours. The installers were friendly and professional. We did have a bit of an issue with some damage to our lawn, however I contacted the company (Rich M) and they responded immediately, did a great job and did so no hassle whatsoever. I would recommend this company to anyone who is in need of a generator."
22KW Installation
18KW Installation
Preparation for the day
Photos
Response time1 day
Response rate98%
74 neighbors recently requested a quote
Avatar for Preferred Electrical Services, LLC
Preferred Electrical Services, LLC
4.6(
16
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business

Serving Andover, NH and surrounding areas

Approved

In business since 2006

Free estimates

Credit card accepted

"Preferred Electric came right out to provide me with an estimate, which was lower than others and he seemed professional, so I hired him. He was able to perform the work within 2 weeks. He came and did the work himself. He installed the bath fan and kitchen curciuts as requestd. I then had him come back to install the smoke and CO2 Alarms in the house."
Response time7 hrs
4 neighbors recently requested a quote
Recommended by100%of homeowners
American Electric
5.0(
5
)
Fixed Generator - InstallFixed Generator - Repair

Serving Andover, NH and surrounding areas

Approved

In business since 2022

Free estimates

Credit card accepted

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business. \n

Response time5 hrs
Recommended by80%of homeowners
Avatar for Brens Electric LLC
Brens Electric LLC
5.0(
1
)
Generator - Install - For BusinessPortable Generator - Install

Serving Andover, NH and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

We bring years of proven experience and a strong work ethic to every project we undertake. As a fully licensed and insured electrical contractor, we combine technical expertise, attention to detail, and strict compliance with all applicable electrical codes and safety standards. Our work is performed with professionalism, precision, and accountability. Whether managing complex electrical systems or providing routine maintenance, every task is completed with a focus on quality, reliability, and long-term performance. Our goal is to build lasting relationships built on trust, consistency, and exceptional service.\n

800A Service Upgrade
800A Service Upgrade
5 neighbors recently requested a quote
Jenna
New to Angi
Portable Generator - Repair

Serving Andover, NH and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

We're a hardworking independent local team that takes pride in providing reliable, affordable home improvement and property maintenance services. We believe in showing up on time, communicating clearly, treating every home with respect, and leaving every job cleaner than we found it.\n\nWhether you need help with furniture assembly, painting, lawn care, general handyman projects, cleaning, or home maintenance, we have experienced team members ready to help. For projects that require licensed electrical work, we work with a licensed electrician to ensure the job is completed safely and professionally.\nOur goal is simple: quality work, fair pricing, and satisfied customers. We understand your time is valuable, so we work efficiently while paying attention to the details that matter.

Avatar for UCS Construction and Design
UCS Construction and Design
New to Angi
Portable Generator - Repair

Serving Andover, NH and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

We are new company just getting started I have a team of licensed professionals I work with. We are very well rounded in our field of work. Doing everything from small handyman repair and installation work to full remodels and renovations. No matter how big or small the job is we are here to help and give great prices and discounts to help home owners and other professionals. Always leaving up to code, quality work, and satisfied customers behind. We also do custom work such as Accent/feature walls that give a home that unique and elegant feel to it.

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Generator Install FAQs, answered by experts

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.

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.

Generally, you’ll want to keep between 60 and 70 feet between the generator and the transfer switch. There are a few reasons for this, including:

  • The distance reduces the noise coming from the generator into your home.

  • It increases efficiency because you won’t have a voltage drop from this short of a distance.

  • Prevents carbon monoxide poisoning: keep at least 15 feet between your generator and an open window. 

If you’re deciding between a solar battery versus a generator for the best backup power solution, you can take a few factors into consideration. Solar batteries are quiet while generators can be quite loud. Generators have a lower up-front cost, but they require fuel and ongoing maintenance while solar batteries are more expensive but don’t have many ongoing costs.

You can expect a diesel generator to last for up to 30,000 hours of use, which works out to 20 to 25 years with the proper maintenance, of course. That depends on how much you use it, so a diesel generator used for emergencies a couple of times a year will last a lot longer than a generator that takes over for a faulty electrical grid every month for a day or two. 

The Andover, NH homeowners’ guide to generator installs

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