What size generator do I need for a 1500-square-foot house?

• <div><p>A 1,500 square foot home will likely need a 15kW to 20kW generator. When deciding on whole-house generator size, add up the <a href="https://www.angi.com/articles/how-many-watts-house.htm">total wattage</a> of the devices that you’d like to continue running during a power outage. That way, you can ensure you purchase a generator that can power your necessary appliances or medical equipment during an electrical emergency.</p></div>

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Q: Is it worth it to install a whole house generator?

• <div><p>A whole house generator can be worth the extra money for peace of mind if your home is prone to power outages for extended periods of time or if you have life-saving medical equipment that needs to maintain power at all times. These devices can also increase your home&rsquo;s value, especially in areas prone to extreme weather and power outages. </p></div>

Q: Do you have to turn off the main breaker when using a generator?

• <div><p>As a safety measure, you should always turn off the main breaker while operating your generator&rsquo;s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.</p></div>

Q: Do I really need a generator transfer switch?

• <div><p>Yes, in some locations, it is required by the National Electric Code (NEC) to have a transfer switch installed for <a href="https://www.angi.com/articles/what-is-an-electrical-emergency.htm">electrical emergencies</a>. In addition to following electrical code, generator transfer switches ensure your home is fully protected during a power outage. By switching the power from the main breaker to the generator breaker, you can seamlessly operate your HVAC, lights, appliances, devices, and more during an emergency. </p></div>

Q: Where can you install a whole-house generator?

• <div><p>Whole-house generators need to be installed on level ground several feet away from walls and other objects. Because they tap into the electrical system directly, they usually need to be close to your home electrical panel for a transfer switch installation. It also helps with installation if they are near to a gas line or propane tank installation.</p></div>

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Verified Reviews for Generator Install pros in Whetstone, AZ

*The Angi rating for Generator Install companies in Whetstone, AZ 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 Whetstone, AZ 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 November 17, 2025

Reviewed in September 2019
I supplied the garage door opener. They installed expertly and efficiently. Would hire again.
Westover Garage Door Service LLC
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Reviewed in June 2019
Josh, James, and Manny are an awesome crew and did a fantastic job on the installation side of things, there was definitely a miscommunication on the product, but the install went very smoothly, I would highly recommend this crew for any installation
Dreamstyle Remodeling of Southern Arizona
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Reviewed in February 2019
Oscar came out and measured when promised. Delivery was anticipated in 8 weeks. 8 weeks later Leo called and set an installation appointment. Installation was on time, done quickly and the blinds look great.
AZTEC Blinds & Shutters
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Reviewed in February 2018
Mr. Clifford Leo and his assistant were right on time, friendly, polite and got the job done expertly. Explained the new heater to me, assured me they would do the draining/maintenance in a year, as part of the service of installation. They also took a look at the gas line I needed to have a...
Cliff's Classic Care Plumbing LLC
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Reviewed in July 2017
Both installers were great, and the guy who did the duct cleaning. I'm satisfied with what I received for the amount I paid.
Arizona Comfort Systems
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Reviewed in June 2015
When I originally called to make the appointment, I was told that they were not carrying the generic heart worm preventative anymore, that the company went out of business, and that they were now carrying the high dollar one. We were also told that we would have to pay for a "wellness exam"...
Coronado Veterinary Hospital
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Reviewed in June 2014
I decided to replace my 13 windows and 3 entry doors. I found R & R Express were authorized installers for Pella Windows, so I went with them , R & R handled everything, windows and doors, from measuring to installation, i was kept informed of expected delivery from factory to install date,...
R & R Express LLC
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Reviewed in June 2014
We had them install cabinets and countertops. The price was high. The countertops took awhile to get installed due to how long it took the cabinets to be installed. The cabinets still have writing that you can see on the side that has been shallacked over. They used two different color...
LOWE'S
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Reviewed in June 2013
We have used San Pedro Plumbing to: (1) install water softener (post construction); (2) provide and install 50 gal hot water heater; (2) install two upstairs toilets. All services were beyond expectations. The prices quoted were reasonable. The service provided was timely and professional. ...
San Pedro Plumbing
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Find Generator install pros in Whetstone

Gruber Power Services has been providing power protection solutions since 1984! Our expertise ranges from small PC based power protection products, to the largest of UPS/Power Conditioning and Distribution Systems, and encompasses all the technologies available from solid-state products, to rotary and engine generator design systems. Our corporate headquarters is located in the "Valley of the Sun" or better known as Phoenix, Arizona. The wonderful weather nearly year-round helps us attract and retain a very talented labor force. We enjoy visitors and welcome you to experience our hospitality.

SFA, LLC

3.67(

)

SFA, LLC

3.67(

)

27 years of experience

Electrical contractor offering quality electrical services to residential, commercial and industrial sectors. We have a team of highly skilled employees dedicated to meeting the needs of our clients. Our goal is total customer satisfaction with work done in the safest and most efficient manner.

"The install went well, with one small detail forgotten. There was one pole that we needed for mounting something to the fence. That is an easy fix and the installers will come back in a day or two to finish it up. We called several other fencing companies in Tucson and none of them were doing what we were wanting. Although the price seemed high, they did have to dig through some asphalt to mount the poles. In all, it was exactly what we needed and they did a great job installing."

Eric L on July 2018

"The install went well, with one small detail forgotten. There was one pole that we needed for mounting something to the fence. That is an easy fix and the installers will come back in a day or two to finish it up. We called several other fencing companies in Tucson and none of them were doing what we were wanting. Although the price seemed high, they did have to dig through some asphalt to mount the poles. In all, it was exactly what we needed and they did a great job installing."

Eric L on July 2018

My Classic Car Trader LLC

2.00(

)

My Classic Car Trader LLC

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

Generator Install questions, answered by experts

A whole house generator can be worth the extra money for peace of mind if your home is prone to power outages for extended periods of time or if you have life-saving medical equipment that needs to maintain power at all times. These devices can also increase your home’s value, especially in areas prone to extreme weather and power outages.

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

Yes, in some locations, it is required by the National Electric Code (NEC) to have a transfer switch installed for electrical emergencies. In addition to following electrical code, generator transfer switches ensure your home is fully protected during a power outage. By switching the power from the main breaker to the generator breaker, you can seamlessly operate your HVAC, lights, appliances, devices, and more during an emergency.

Whole-house generators need to be installed on level ground several feet away from walls and other objects. Because they tap into the electrical system directly, they usually need to be close to your home electrical panel for a transfer switch installation. It also helps with installation if they are near to a gas line or propane tank installation.

A 1,500 square foot home will likely need a 15kW to 20kW generator. When deciding on whole-house generator size, add up the total wattage of the devices that you’d like to continue running during a power outage. That way, you can ensure you purchase a generator that can power your necessary appliances or medical equipment during an electrical emergency.

The Whetstone, AZ 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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Alison Kasch
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Oct 29, 2025Oct 29, 2025
How Much Does It Cost To Install a Generator Transfer Switch? [2025 Data]
The cost to install a generator transfer switch depends on several factors. Our guide will help you understand all of the costs.
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Aug 14, 2025Aug 14, 2025
How Much Does a Whole-House Generator Cost? [2025 Data]
The average cost of a whole-house generator falls between $5,000 and $25,000. Keep reading to learn how much you can expect to spend.
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Oct 30, 2025Oct 30, 2025
How Much Does Whole-House Generator Maintenance Cost? [2025 Data]
Keeping on top of generator maintenance and repairs gives you extra peace of mind as a homeowner. Find out how much regular generator maintenance costs.
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Mar 24, 2025Mar 24, 2025
Home Standby Generators vs. Battery Backup Systems: Which Is Right for Your Home?
Generators are a home essential when a power outage strikes. Compare home standby generators vs backup battery systems to find the best one for you.
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Apr 1, 2025Apr 1, 2025
Diesel Generator Maintenance Services: 10 Steps to Know
Diesel remains a popular fuel option for a variety of home generators, but you will need to plan your maintenance carefully. Here’s how it works.
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Jul 23, 2024Jul 23, 2024
15 Generator Uses for Homeowners
A portable generator can serve several uses beyond its traditional purpose. If you’re looking for ways to put your generator to work, our guide can help.