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.
Can a Whole-House Generator Run an Air Conditioner?
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A whole-house generator for an air conditioner needs enough wattage to handle startup surge power, which is the high initial burst your AC requires.
Expect to pay $5,000 to $25,000 for a whole-house generator, so choosing the right size for your home keeps your AC running during outages.
Your generator's performance depends on fuel type, load management, and environmental factors like temperature, humidity, and altitude affecting your system's efficiency.
Hiring a local general contractor provides reliable guidance on generator sizing and installation, keeping your home powered safely during emergencies.
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A power outage can be more than an annoyance—it can leave you without essential systems, including air conditioning. If you rely on a whole-house generator, you might wonder whether it has enough power to keep your AC running.
The answer depends on several factors, including the generator's wattage, the type and size of the air conditioning system, and the overall energy demand in your home. Here’s what you need to know to ensure your whole-house generator can safely support your home’s cooling needs.
Can a Whole House Generator Support Central AC?
A whole-house generator can maintain a home's air conditioning system during power outages, but there are a few factors to consider. A whole house generator's ability to power an AC system depends on its capacity or wattage output, the type and size of the air conditioner (i.e., central AC or window unit), and whether other home appliances are running simultaneously.
Whole-house generators are designed to handle multiple appliances at once. However, air conditioners require a high starting wattage, which can strain a generator if it isn't properly sized. Startup surge power, or locked rotor amps (LRA), is a short burst of high wattage needed to turn on a whole house generator's compressor. Generators must accommodate this surge to avoid overloading.
What Should I Consider When Purchasing a Whole House Generator?
To determine if your generator can handle powering an air conditioner during an electrical emergency, consider whether you actually need one. If you live in a smaller space or do not need to power your entire house, you may want to consider a portable generator. However, portable generators cannot power your entire AC system during an outage.
If you need a whole house-generator, determine its wattage you’ll need by adding the wattage of the appliances you’ll want powered during the outage. A generator installer or contractor near you can also help you determine the size you’ll need.
You should consider the type of fuel you’ll need (diesel, propane, or natural gas) and its accessibility. Finally, keep your budget in mind, as whole-house generators can cost from $5,000 to $25,000, not including fuel or maintenance.
What Are Some Factors That Impact Whole-House Generator Performance?
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Keep these factors in mind when using your whole-house generator to ensure peak performance.
Several factors influence whether your generator can efficiently run an air conditioning system, including.
Environmental factors: Factors like temperature, humidity, and altitude can impact your generator’s ability to run smoothly.
Fuel type: Propane and diesel offer great fuel efficiency, but require frequent refills. Natural gas generators can run longer thanks to its permanent fuel source.
Load management: Load management affects generators, as running too many appliances at once can strain them.
Age: The age and efficiency of AC units also impacts generator efficiency—older systems may draw more power.
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Generator installs reviews from real Angi homeowners in Columbus, OH
Last update on October 04, 2026
- Marwan T.
If you’re good people wanting to do business with good people, hire Matt. He is a consummate professional and utterly competent. He installed a water heater in my home at a price that beat competitors by hundreds of dollars with a promise to support the unit for its life (even after its 6 yr...
Greene's Plumbing Services - Rob H.
I recently had Mosby Electric perform an electrical installation on 8-14-2026, and I couldn’t be more satisfied with the service. From the moment I called, their team demonstrated fast arrival and professionalism. The electricians were highly knowledgeable, completing the installation...
Mosby Electric - Sarah E.
Joseph did a great job with the staircase and trim. Timely and efficient, clear communication about the work, very fair pricing. For the stairs in particular, done very skillfully in an old house (1893) in a tight spiral, and very creative with how to do the handrail. Did a nice job with...
Vouis Trim Carpentry L.L.C. - Maggie M.
Jason has helped me with multiple household projects, with the most recent being new door installation. He has always showed up on time and organized and has done an incredible job! Jason is very professional and he's now my go-to for anything around my house that needs to be fixed or...
Huff Garage Rescue, LLC - Jeanann S.
Very professional, knowledgeable and helpful! Completed the install on time and as expected.
Ward's Services - Grace G.
Excellent, Prompt, Courteous Service!!! They were super friendly and quite personable. I felt very comfortable with the gentlemen that did the installation. They installed it exactly where I asked them to and they did an excellent job!! I loved their service so much.
Tether House - Lauren R.
The Mosby team went above and beyond for my project. They not only installed my light fixture; they also worked through an old, wonky, and as it turns out incorrect wiring issue from the work of prior contractors. Professional, thorough, conscientious, and kind. Five star experience. Thank you!
Mosby Electric - David E.
Window Depot did an amazing job installing the windows in my basement! The process from start to finish was by far more than what I expected. I would highly recommend Window Depot if you want professionalism from the the consultation to the installation. Dont settle for mediocre when you can...
Window Depot USA of Central Ohio - Mary O.
The guys did an outstanding job and we had a great experience with CarifaTile. I appreciated that Joe reviewed the quotes with me and set expectations prior to the install. The crews showed up as scheduled and always left the areas clean upon leaving the house. We will definitely use...
CarifaTile - Matthew L.
Called ahead and worked quickly to install keyless locks on vintage wooden doors.
Expert Lock and Key, LLC
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