Get matched with top generator install pros in Madison, NH

Q: What is the life expectancy of a whole house generator?

• <div><p>Whole-house generators can last<b> 20 to 40 years</b> with normal operation and proper maintenance. If you look up the specifications for your generator, you may be able to find a lifespan rated in hours of operation. Life expectancy will vary depending on how often and for how long you use the generator each year. Choosing a fuel with low impact like natural gas or diesel can help generators last as long as possible.</p></div>

Q: Is it better to repair or replace a malfunctioning generator?

• <div><p>It&rsquo;s usually better to repair your generator if it isn&rsquo;t working properly, as it will typically be much more affordable and should yield similar results. Generator repairs cost around <b>$300</b> on average, while <a href="https://www.angi.com/articles/how-much-does-it-cost-install-generator.htm">installing a new whole-house generator costs</a> around <b>$5,000 </b>on average. The only exception is if you know your generator is reaching the end of its useful life, usually between 30 and 40 years. If you have an older generator, you could face multiple repairs in the coming years, which might mean that a full replacement will be more cost-effective over time.</p></div>

Q: How long can a whole house generator run?

• <div><p>As long as they have enough fuel, whole-house generators can run for weeks at a time (400 to 500 hours) without suffering too much wear and tear. However, this type of extensive use isn&rsquo;t ideal if you want to extend the life of your generator.</p><p>Two important points. First, some generators may need you to periodically check oil levels every day or so and refill as necessary for safe operation. Second, if your generator uses a fuel tank, keep it regularly full so it doesn&rsquo;t suddenly shut off. Many backup generators can run through a full tank in a day when they are powering large portions of a home.</p></div>

Q: Can I install a portable generator myself?

• <div><p>DIY is possible for basic setups. Professional installation ensures safe and proper electrical connections.</p></div>

Q: What’s the lifespan of a natural gas generator?

• <div><p>When properly maintained, natural gas generators can last a long time, as much as <b>20 to 40 years</b>. They have relatively few needs compared to generators with other fuel types. However, the generator&rsquo;s lifespan ultimately depends on how often the generator is used and for how long it&rsquo;s left running.</p></div>

Enter your zip and get matched with up to 5 pros

Verified Reviews for Generator Install pros in Madison, NH

*The Angi rating for Generator Install companies in Madison, 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 Madison, 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 January 08, 2026

Reviewed in June 2025
We needed same day confirmation (photos) of a tenant move and a lockbox installed. Jason responded quickly and efficiently. We will definitely consider Jason for future needs.
Jason Cameron
Request a quote
Reviewed in April 2024
Once again and with the highest confidence, we hired Russell's Contracting to convert our back entrance into a more open, useful mudroom. As promised, they arrived on time on the expected date and started by sealing off the back entrance for dust. The demolition of the closet was first done,...
Russell's Contracting, LLC
Request a quote
Reviewed in December 2023
On time!! Came when they said they would. Did a professional install and cleaned up before they left. Easy to get along with and knowledgeable about their trade. Well pleased!
HVAC Solutions 207, LLC
Request a quote
Reviewed in August 2022
Eric was very pleasant to work with, reliable and professional. Adam was great, he did a great job installing the shower and did it all in one day.
Granite State Piping
Request a quote
Reviewed in May 2021
Our water was completely out when our well pump died. Lakes Region Pump & Irrigation new we were without water and they came out the same day to make sure the problem was with the pump and then came back the next morning to pull the old pump and install a new one. They made sure we had the...
Lakes Region Pump & Irrigation
Request a quote
Reviewed in May 2020
Knowledgeable, easy to work with, great idea generator, could not be happier with work Asked what services required and did not try to increase scope Quoted price and held it Wonderful experience!
Osprey Design
Request a quote
Reviewed in August 2019
Service was great from initial appointment to install; very professional company
Nuimage Outdoors
Request a quote
Reviewed in January 2019
It has two years of trying to work with Robert Nelson of RWN over simple installation of stairs. In emails he said he would remove the and redo the steps but he never returned. Steps were supposed to replicate in color and texture of two granite steps in place. As you can see in the photo they...
RWN Property Services Inc.
Request a quote
Reviewed in July 2017
The installers were professional and did a great job. Their clean up was flawless .
Bath Planet RIC
Request a quote
Reviewed in October 2015
Do not use this provider for electrical services, exceptionally poor experience. Although the company's responsiveness was very good (within a few days of calling) the following problems occurred during the initial, and necessary follow-up visit to correct the first visit's mistakes: 1) Quoted...
Heritage Home Service
Request a quote