What size generator do I need for my house?

• <div><p><a href="https://www.angi.com/articles/what-size-generator-do-i-need.htm">Generator size requirements</a> vary wildly among properties, but typical generator sizes are listed below based on home square footage:</p><ul><li><p>1,000 sq ft: 6–9 kW</p></li><li><p>1,500 sq ft: 7–10 kW</p></li><li><p>2,000 sq ft: 10–14kW</p></li><li><p>2,500 sq ft: 12–16kW</p></li><li><p>3,000 sq ft: 16–20kW+</p></li></ul><p>Unfortunately, home square footage isn’t always a good indicator of generator size requirements. Instead, you should call in a professional to discuss which items in your home you’d like to run via your generator. They can calculate peak and average consumption for those items and then size your generator appropriately for optimal performance.</p></div>

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Q: Are natural gas generators worth it?

• <div><p>While natural gas generators are costly, they&rsquo;re a great option for standby power due to the reliability of natural gas as a fuel source. Unlike other fuels, natural gas is delivered through underground pipes, making outages extremely rare and less likely to be affected by the elements. As long as the area isn&rsquo;t prone to earthquakes, they offer an unlimited supply of natural gas that doesn&rsquo;t degrade over time or require storage in tanks.</p></div>

Q: How do generator specifications and installation requirements impact the overall cost?

• <div><p>Costs depend on generator type, labor, and additional wiring or transfer switch requirements.</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>

Q: What happens with the generator when the local power goes back on?

• <div><p>If you have a transfer switch properly installed, the generator and main electrical power cannot feed the system at the same time. However, you should still shut off the power at your main circuit breaker panel before activating the generator. If you do that, you&rsquo;ll simply need to shut off the generator and reset your circuit breaker once the local power comes back on.</p></div>

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Verified Reviews for Generator Install pros in Lenox, IA

*The Angi rating for Generator Install companies in Lenox, IA 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 Lenox, IA 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 May 2025
Installed new LVP flooring, along with new trim. Completed when he said he would, work looked great! Also installed a front door!
Savage Renovations, LLC
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Reviewed in May 2025
Excellent job of installation - friendly, answered my questions. Cleaned up after the job. Love the windows!
Renewal by Andersen
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Reviewed in December 2024
Great customer service Fast installation Affordable service Skyline tore off and re did the asphalt roof on my house after wind and hail damage. I was so impressed I hired them to also do my garage and shed. These guys do great work.
SKYLINE RESTORATION INC
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Reviewed in December 2023
Jon, Ler and Emanuel L were the crew who installed 5 piers on the corner of my house. They were very efficient, and left things looking exactly as before they did the job. I received updates as their work progressed.
Groundworks
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Reviewed in June 2023
David was personable, prompt, and precise in his installing of a deadbolt and door knob. I would hire him for other work, as well! 5/5
David J. Soukup Construction, Inc.
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Reviewed in September 2022
The installer did a very good job. The only hang up was the bracket for my shower seat. The package was labeled for a right side bracket, but a left side bracket was inside the page. It was mislabeled at the warehouse. Certainly not the installers fault. Bath Planet scheduled a time to come...
Bath Planet
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Reviewed in February 2020
Phil and his crew rearranged their current jobs to ensure that our floors were refinished in time to get the painting done before our move-in date. We also asked them to remove all the baseboards and quarter round - which was good thing because then we could see how poorly the flooring had been...
Oak Wood Floor
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Reviewed in May 2017
Everything went well. Installation and adaptation to my existing ducts was exactly as I wanted it. The price seemed high, but they were actually the lowest of 3 local bids.
C AND K Heating, Cooling & Plumbing
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Reviewed in August 2016
I decided to make the purchase though I did not need all of the equipment. The TRITON 9000 RS Generator/Compressor/Welder machine was what I really had my eye on. I had never seen a machine with so many functions before. The 10,000 gas generator is the machine I needed the most, but the other...
AMP-American Multi-Products
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Reviewed in May 2014
Our first interaction with our point of contact went well. We were given lots of information in both oral and written form. Sales person was not pushy and was very prompt with his estimates. We accepted the proposal, scheduled an installation date, andproceeded to have the system installed. The...
Neighbors Heating Cooling Plumbing & Geothermal
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Find Generator install pros in Lenox

Panora Auto Parts

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Panora Auto Parts

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14 years of experience

We specialize in small engine repair including brands like Stihl, Toro, Briggs & Stratton, Honda, Kohler, etc. Pick up and delivery is included within a 15 mile radius.

IA Electric

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IA Electric

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12 years of experience

Full service electrical contractor serving the North Iowa area. We use flat rate pricing that guarantees the price we quote is the price you pay, no surprises when the invoice shows up.

Trinity Electrical Services LLC

5.00(

)

Trinity Electrical Services LLC

5.00(

)

Customers say: Quick response

Recommended by 100% of Angi customers

We are a family run full service electrical contracting company based in Sioux City, Iowa. No project too big or small for us.

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

While natural gas generators are costly, they’re a great option for standby power due to the reliability of natural gas as a fuel source. Unlike other fuels, natural gas is delivered through underground pipes, making outages extremely rare and less likely to be affected by the elements. As long as the area isn’t prone to earthquakes, they offer an unlimited supply of natural gas that doesn’t degrade over time or require storage in tanks.

Costs depend on generator type, labor, and additional wiring or transfer switch requirements.

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.

If you have a transfer switch properly installed, the generator and main electrical power cannot feed the system at the same time. However, you should still shut off the power at your main circuit breaker panel before activating the generator. If you do that, you’ll simply need to shut off the generator and reset your circuit breaker once the local power comes back on.

Generator size requirements vary wildly among properties, but typical generator sizes are listed below based on home square footage:

1,000 sq ft: 6–9 kW
1,500 sq ft: 7–10 kW
2,000 sq ft: 10–14kW
2,500 sq ft: 12–16kW
3,000 sq ft: 16–20kW+

Unfortunately, home square footage isn’t always a good indicator of generator size requirements. Instead, you should call in a professional to discuss which items in your home you’d like to run via your generator. They can calculate peak and average consumption for those items and then size your generator appropriately for optimal performance.

The Lenox, IA homeowners’ guide to generator installs

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

See all articles

Elisa Greenberg
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Aug 14, 2025Aug 14, 2025
How Much Does a Whole-House Generator Cost? [2025 Data]
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How Much Does It Cost To Install a Generator Transfer Switch? [2025 Data]
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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 11, 2025Mar 11, 2025
How Much Does a Natural Gas Generator Cost? [2025 Data]
Natural gas generators are whole-home standby generators that are connected to your home’s natural gas line. The average cost for a natural gas generator is $12,000.
Elisa Greenberg
•
Aug 14, 2025Aug 14, 2025
How To Connect a Generator to Your House Without a Transfer Switch
Using a generator during a power outage is a lifesaver. Our guide will show you how to connect a generator to your house without a transfer switch.
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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.