How long does a whole-house generator last?

<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>

There are 8 highly-rated local generator installers.

Verified Reviews for Generator Installation pros in Chattahoochee Hills, GA

*The Angi rating for Generator Installation companies in Chattahoochee Hills, GA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Installation needs.

*The HomeAdvisor rating for Generator Installation companies in Chattahoochee Hills, GA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Installation needs.

Last update on April 25, 2025

Reviewed in March 2024
As a mechanic myself, it’s an Absolute pleasure working with these guys. Professional, knowledgeable, humble and diligent. Looking forward to their services in the future. Thanks again!
All Pro Generator Service & Repair, LLC
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Reviewed in March 2016
The technician arrived right on schedule, performed the service quickly and explained what he was doing. He was in and out quickly and though he recommended some add ins to my systems did not push them on me, overall pleasant experience
TE Certified Electrical, Plumbing, Heating & Cooling
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Reviewed in May 2022
The service was exceptional. He was on time and the work quality was very professional. The electrician was extremely knowledgeable and respectfully answered my questions. I will definitely be a repeat customer.
Edlectric Services LLC
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Reviewed in April 2022
Masters Generator and Electrical Service did an outstanding job installing my 22kw whole house generator and automatic transfer switch. In the process they also upgraded my breaker box to a 200 amp service. From the quote to the completed job, they are very professional, efficient, and...
Masters Generator and Electrical Service
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Reviewed in October 2009
Installation of the generator was smooth except for some confusion when they reinstalled my existing surge suppressor and signal bridge in my existing load center.
PERKINS GENERATOR SALES & SERVICE, INC.
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Reviewed in September 2014
It took just over a week from first contact to the job being done, which I found very satisfactory. The crew was polite and hard-working, even on a big job like the breaker box. The chandelier was an additional job that I had forgotten to include when we obtained estimates, but they had no...
Powers Electrical Solutions LLC
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Reviewed in May 2020
The High Electric Team are incredible! They are professional, courteous, trust worthy and overall a pleasure to work with. I will definitely be using them again in the near future. I highly recommend!
High Electrical
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