How long does a whole-house generator last?

• <div><p>When maintained properly, a whole-house generator can last up to <b>20 years</b>. <a href="https://www.angi.com/articles/how-much-does-generator-repair-cost.htm">Costs to maintain and repair generators</a> vary by location and type of generator, but you can expect to pay about <b>$150 to $300 per year</b> for annual generator maintenance checks. An experienced generator service technician will inspect your generator’s engine filter, starting mechanism, fuel, lubrication, and coolant levels to keep your generator in good working condition for as long as possible. </p></div>

How many days can a standby generator run continuously?

• <div><p>The <a href="https://www.angi.com/articles/how-long-can-whole-house-generator-run-continuously.htm">amount of time a standby generator can run continuously</a> is around <b>3,000 hours</b> on average. However, standby generators can generally run indefinitely as long as they have a continuous fuel supply. Generators hooked up to a home’s natural gas supply are the best option for extended usage, as these won’t rely on a finite fuel supply based on how much you have in storage. Generators running on liquid propane or diesel won’t last as long, as these require fuel storage and regular refueling to stay running.</p></div>

Get matched with top generator install pros in Cavendish, VT

Q: What size generator do I need for a 2,500-square-foot house?

• <div><p>A home that is 2,500 square feet will likely need a 20kW to 25kW generator. Consult your local generator installer to confirm the generator size needed to power your home before purchasing a new one. Be sure to consider how much power your necessary devices need to run.</p></div>

Q: What’s the normal lifespan of a diesel generator?

• <div><p>You can expect a diesel generator to last for up to <b>30,000 hours of use</b>, 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. </p></div>

Q: What size generator does my house need?

• <div><p>You can determine what size generator you need by listing the various appliances it will power during an outage. Write down the start-up watt usage, and then add them all together. </p><p>A 7,500-watt generator will run your refrigerator, freezer, well pump, and lighting circuits without a problem. However, you&rsquo;ll need an extra 3,000 to 4,500 watts to run your water heater and another 5,000 to 25,000 watts to run your electric furnace. In these instances, a whole-home generator is your best bet for running your critical equipment.</p></div>

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Verified Reviews for Generator Install pros in Cavendish, VT

*The Angi rating for Generator Install companies in Cavendish, VT 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 Cavendish, VT 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 October 26, 2025

Reviewed in August 2024
Great quality installation with reasonably priced
Your Local Floor Pro LLC
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Reviewed in February 2024
Excellent job with hard working and respectful employees - cleaned the basement of 200+ year old home littered with generations of junk as well as mold; it now looks fantastic. Shoveled out drive way as a bonus.
Silver Environmental
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Reviewed in January 2024
We had a new chimney and 2 liners installed. Steve was awesome! Explained all aspects of the work and did a beautiful job!
Kearley Masonry
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Reviewed in November 2022
Had a gutter system installed this fall. The customer service reps were friendly and knowledgeable. After install, saw a small concern in which they immediately came out and addressed. Problem was more the roof than the gutter system actually.
Clear Choice Home Improvements, LLC
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Reviewed in July 2022
Only placed our order on July 21, not installed yet.
Budget Blinds of Concord & Hanover
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Reviewed in January 2022
Sincal installed a new chimney and air tube fell out after 5 uses. Tech came o tightened part and it fell out 2 days later along with bricks. Company blamed us of taking brand new chimney apart. Took about 2 months for a response just wanted $150 refund for the fact that what they fixed fell...
Sin Cal Chimney's
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Reviewed in February 2021
They were on time and very efficient, complete install done in one day. Many excellent additional features we took advantage of, such as surge suppressor and monitoring. Honest and dependable company to work with. Would recommend them without hesitation.
Generator Supercenter of Maine
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Reviewed in October 2017
The men from Claremont Glassworks did an excellent job when I had my garage doors replaced. They were on time, professional, and polite. They had both doors removed, and new ones replaced, plus two new garage door openers installed, in only a couple of hours. Great doing business with them
CLAREMONT GLASSWORKS
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Reviewed in September 2016
On time bed was installed in my water bed frame which I wanted to keep. Install went great. Very happy with our bed. No problems.
SleepZero Sleep Systems
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Reviewed in August 2012
They helped me find stain free carpet, came out to my house to do the measuring, and their installers were extremely professional and fast. They also allowed me to do two rooms in one day and two more the next day.
O'Briens Carpet One Floor and Home
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Find Generator install pros in Cavendish

Vertex Contracting Inc.

Vertex Contracting Inc.

Customers say: Quick response

Recommended by 100% of Angi customers

126 local quotes requested

3rd generation electrician. We specialize in re-wiring historical sites, electrical services, repairs, installs, troubleshooting, lighting, panel upgrades, ceiling fans, EV/Electric Charging Stations, and more! We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -or- click to schedule a free estimate today!

"They are outstanding!"

Jake V on August 2023

"They are outstanding!"

Jake V on August 2023

McCormick Electrical, LLC

McCormick Electrical, LLC

Customers say: Quick response

Recommended by 100% of Angi customers

2 years of experience

Welcome to McCormick Electrical, LLC! In business since 2023, we are a full service electrical company who takes great pride in the quality of our work and guarantees customer satisfaction. We specialize in all maintenance and repair for both residential and commercial properties, and no job is too big or too small. Serving Rutland and its surrounding towns, be sure to give us a all today!

"Colin was prompt with his communication, responded within 24 hours to any inquiries, and made smart recommendations when we hired him to install our L2 Charger and replace a burnt-out switch in our kitchen. He worked smart & safe and finished them both in less time than I expected it to take. We would hire/recommend Colin to anyone seeking big or small project repairs."

Marc S on June 2024

"Colin was prompt with his communication, responded within 24 hours to any inquiries, and made smart recommendations when we hired him to install our L2 Charger and replace a burnt-out switch in our kitchen. He worked smart & safe and finished them both in less time than I expected it to take. We would hire/recommend Colin to anyone seeking big or small project repairs."

Marc S on June 2024

Northstar Electric LLC

494 Church Rd.

4.94(

)

Northstar Electric LLC

494 Church Rd.

4.94(

)

Customers say: Quick response

Recommended by 100% of Angi customers

Northstar Electric is a responsive and reliable provider of electrical services for both residential and commercial clients. Our team of experienced professionals is dedicated to providing the highest quality of electrical services, ensuring that each job is completed to the highest standard. We are proud to be your trusted and dependable source for all your electrical needs. Our commitment to excellence and customer satisfaction is unmatched in the industry. We are confident that you will be pleased with the quality of services and results that we deliver. Have you worked with us before? We'd love your feedback. Consider leaving a review on the Testimonials page or on Google.

"Excellent work and on time in an extremely difficult location."

Doug T on April 2021

"Excellent work and on time in an extremely difficult location."

Doug T on April 2021

Schaal Electric PC is a family ownwed and operated business located in Wilder Vt since 1972. We are a full service electrical contractor and are regions Distributor for Gillette Generators. Offering to dealers,contractors and retail sales installation and service on all models.We offer a fully installed turn key system.

RICHARD ELECTRIC INC

131 A ST

4.15(

)

RICHARD ELECTRIC INC

131 A ST

4.15(

)

Customers say: Quality work

65 years of experience

Established in 1960. We have 24 hr. emergency service available. Work is completed by Licensed Electricians and Registered Apprentices per the National Electrical Code.

My Classic Car Trader LLC

312 Prospect Ave

2.00(

)

My Classic Car Trader LLC

312 Prospect Ave

2.00(

)

53 years of experience

Sales, Service & Rebuilding of Antique and Classic Car Components such as, Carburetors, Starters, Generators, Fuel Pumps, Double & Single Action Fuel Pump Rebuilding, Water Pumps, Hydraulic Top Pumps, Distributors, and DELCO Knee Action Shocks, We also carry a complete line of NOS and NORS parts. We offer FREE Technical advice for any YEAR Classic Car 609-462-7412

"Beware. They charged me double shipping even after I told them I would wait so I wouldn’t have to pay two shipping fees. The last item was a fuel pump that I had a problem with. I have made 4 calls to ask for help with no return call. Poor"

Frank H on July 2020

"Beware. They charged me double shipping even after I told them I would wait so I wouldn’t have to pay two shipping fees. The last item was a fuel pump that I had a problem with. I have made 4 calls to ask for help with no return call. Poor"

Frank H on July 2020

BT Morin Electric

5.00(

)

BT Morin Electric

5.00(

)

Customers say: Quality work

Recommended by 100% of Angi customers

Residential & light commercial electrical contractor

Powers Generator Service

5 Business Center Dr

4.25(

)

Powers Generator Service

5 Business Center Dr

4.25(

)

Customers say: Super punctual

31 years of experience

Additional address - PO Box 10005, Swanzey, NH 03446. Additional contact name - Sheena Royce. Number of Employees: 45. We offer Financing.

Generator Install questions, answered by experts

A home that is 2,500 square feet will likely need a 20kW to 25kW generator. Consult your local generator installer to confirm the generator size needed to power your home before purchasing a new one. Be sure to consider how much power your necessary devices need to run.

When maintained properly, a whole-house generator can last up to 20 years. Costs to maintain and repair generators vary by location and type of generator, but you can expect to pay about $150 to $300 per year for annual generator maintenance checks. An experienced generator service technician will inspect your generator’s engine filter, starting mechanism, fuel, lubrication, and coolant levels to keep your generator in good working condition for as long as possible.

The amount of time a standby generator can run continuously is around 3,000 hours on average. However, standby generators can generally run indefinitely as long as they have a continuous fuel supply. Generators hooked up to a home’s natural gas supply are the best option for extended usage, as these won’t rely on a finite fuel supply based on how much you have in storage. Generators running on liquid propane or diesel won’t last as long, as these require fuel storage and regular refueling to stay running.

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.

You can determine what size generator you need by listing the various appliances it will power during an outage. Write down the start-up watt usage, and then add them all together.

A 7,500-watt generator will run your refrigerator, freezer, well pump, and lighting circuits without a problem. However, you’ll need an extra 3,000 to 4,500 watts to run your water heater and another 5,000 to 25,000 watts to run your electric furnace. In these instances, a whole-home generator is your best bet for running your critical equipment.

The Cavendish, VT homeowners’ guide to generator installs

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

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