What is the lifespan of a whole-house generator?

<div>When maintained properly, a whole-house generator can last up to 20 years. <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 $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. </div>

How do I know what size generator I need?

<div>When <a href="https://www.angi.com/articles/what-size-generator-do-i-need.htm">choosing the right size generator</a> for your needs, consider a few items to help calculate the wattage you’ll need. Start by determining which household items and appliances you want to power, and then add the wattages together. Check out the wattage of these essential appliances:<ul><li>Refrigerator: 600 watts</li><li>Large dehumidifier: 700 watts</li><li>Large window air conditioner: 1,400 watts</li><li>Water heater: 3,000 watts</li></ul>Running home appliances like these requires a partial or whole-house generator. A portable generator may be enough to power your home if you only plan to keep a refrigerator and freezer running. </div>

What can I run on different generator sizes?

<div>Here’s what you can run with different wattages and types of generators:Portable generator:<ul><li>2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. </li><li>4,000 watts will keep two large appliances operating and a few smaller devices.</li><li>8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.</li></ul>Partial to whole-house generator:<ul><li>20,000 watts and above will make it seem like your home’s power is still on.</li></ul></div>

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Q: How much does a whole-house generator cost?

<div><a href="https://www.angi.com/articles/how-much-does-it-cost-install-generator.htm">Installing a whole-house generator costs</a> about $5,000 on average. Prices range from $1,550 to $8,500, depending on size, brand, fuel type, and assembly. The size of your whole-house generator is the most significant cost factor, with large homes with high energy demands costing the most to power. Types of whole-home generators include:<ul><li>Portable generators with 1kW&ndash;7.5kW capacity: $500&ndash;$2,000</li><li>Partial generators with 9kW&ndash;20kW capacity: $2,000&ndash;$6,300</li><li>Whole-house generators with 22kW&ndash;48kW: $5,000&ndash;$18,000</li></ul></div>

Q: What can I run on different generator sizes?

<div>Here&rsquo;s what you can run with different wattages and types of generators:Portable generator:<ul><li>2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. </li><li>4,000 watts will keep two large appliances operating and a few smaller devices.</li><li>8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.</li></ul>Partial to whole-house generator:<ul><li>20,000 watts and above will make it seem like your home&rsquo;s power is still on.</li></ul></div>

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Verified Reviews for Generator Install pros in Wethersfield, CT

*The Angi rating for Generator Install companies in Wethersfield, CT 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 Wethersfield, CT 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 August 06, 2025

Reviewed in March 2025
Exceptional Service by Frank I wanted to take a moment to express my sincere appreciation for Frank’s outstanding service in troubleshooting and fixing our generator issues. Frank’s technical expertise is truly impressive—he not only possesses an in-depth knowledge of the equipment but also...
Frank's Generator Sales Service & Repair
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Reviewed in September 2020
Zaim and his co-worker showed up on time and performed the work I needed and explained in detail how to use the generator hookup, they were friendly and went beyond what I asked when they found a clamp that had to be screwed into the side of the house that the siding company forgot to do and...
Accurate Electrical Contractors LLC
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Reviewed in April 2015
I called Pace and a message was left for owner to call me back. Peter called back very quickly and we schedule a walk through so he could see the project. The scope of the project chanced a bit after Peter had looked it over, he came back and adjusted his quote to reflect the work and we...
PACE ELECTRIC SERVICE LLC
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Reviewed in October 2015
Jeff and his team did a fantastic job. They were prompt and courteous. They came out and did the work in an efficient manner. Because my electric box was crowded they needed to install a small box for the breakers that will be run by the generator (I don't have a whole house generator). They...
Phase to Phase Electric LLC
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Reviewed in February 2013
I thought they were wonderful. They were very accommodating and very professional. They were very knowledgeable and very willing to answer questions. I would recommend them to anybody.
TOWER GENERATOR SYSTEMS
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Reviewed in September 2014
They were very professional and knowledgeable. I've known one of the owners for quite a long time, back in high school days. They also did electrical work at my place of employment.
O.J. Mann Electric Svc, Inc
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