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Articles Generators Informational Topics

What Size Generator Do I Need To Run An Air Conditioner- Resolve Your Query?

Due to overloaded transformers in summer, there may be power loss issues, and your AC might get out of cooling until the electric supply resumes back.

What can you do in that situation? You have to abide by the harsh summer heat because you can’t operate your AC without electricity.

But wait for a second, what if you have a backup power supply, I mean the generator? But a query may arise, what size generator do I need to run an air conditioner?

To solve your query, we are here with this handy guide that will help select the required size generator for your AC to keep it working efficiently.

What Size Generator Do I Need To Run An Air Conditioner

You might not need to suffer the power cut-off situation with a powerful generator.

If you don’t have one, you can purchase it to avoid such issues because not only AC, none of your home electric items would work in the absence of a power supply. 

Let’s get started!

What Size Generator To Run Portable AC?

The required size of the generator depends on the air conditioner size and power usage. If you require running a small window unit air conditioner, a generator of 4,000 watts is enough for the task.

Still, if you opt for a large air conditioner, you might require a 7000+ watts generator, and for a 3-ton air conditioner, 14,000 watts of power. 

As we increase the AC size, the higher wattage generator suits us best. According to the amount of electricity needed for your air conditioner to operate well, generator size is correlated with power, watt ratings, and wattage.

All are therefore connected. When you choose the desired wattage, the appropriate size generator for your AC is automatically chosen.

We suggest the DuroMax XP12000EH dual AC generator, the best performance, cooling, and durability generator.

Factors For Selecting The Right Size Generator For AC? Check It Out

What size generator to run AC? To solve the query various factors might affect the generator size for your home AC.

Types Of Generators:

Generator types include;

  • Portable home generators (starting wattage 5000 watts)
  • Industrial-sized generators (up to 50,000 watts)
  • Electrical generators 


You might be thinking, what size generator do I need to run an air conditioner?

Calculate the necessary wattage to determine the optimal generator size and one that will supply your air conditioner with the necessary wattage for efficient cooling.

AC size  Amp  Running wattage
Small window unit AC  4000 Watts
Medium-sized  5000+ Watts
Large-sized  7000 Watts
Safest AC for home use   10 000 Watts
2 ton  30-Amp 14000 Watts
3 ton  40-Amp 17000 Watts
4 ton  50-Amp 20000 Watts
Industrial-sized  Up to 50,000 watts

In order to run the small-size AC, you could need a generator with 4000 watts or more of power. Depending on the size and use of the AC, the rating may rise.


Select the optimal generator for your AC based on the wattage rating. To prevent problems, keep in mind to increase your maximum power load by 20%.

To make your generator operate effectively, add 20% more watts if your necessary wattage is 4000.


When you’ve found the product in the size you want, check its durability against those of comparable high-quality products. Your AC is a long-lasting component that needs a strong generator to maintain the connection.

To buy the proper-sized generator for your AC, choose the best-reviewed, highest-rated manufacturer.

Fuel Type:

 Portable AC Generators Fuel:
  • Gasoline
  • Propane 
  • Interchangeably dual-mode (gasoline and propane) 
Electric Generator Fuel:
  • Diesel 
Industrial AC Generators Fuel:
  • Gasoline 
  • Propane 
  • Natural gas 
  • Diesel 

Noise Pollution:

Generators that don’t make any noise? Never! However, you can cut it down significantly if you choose the least noisy ones.

Even if your air conditioning is powered by a generator, spend a little more to make your dwellings noise-free.

Remember that portable speakers are a significant source of noise pollution. Choose the quietest portable you can to run your AC effectively and quietly if you decide to get one.

Construction Durability:

A durable and heavy-duty functionality becomes of prime importance for a right-sized generator.

The high-performance, durable, and the perfectly constructed generator will provide your power supply for longer than a cheap and low-quality one. 

Generator Run Time:

The run times of different types and sizes of generators vary depending on regular maintenance, usage, oil level, fuel type, and engine durability.

What size generator, though, will power an air conditioner? It’s easy! Choose the one with the longest runtime that best meets your AC power needs so that your AC can continue to provide effective cooling.

Can You Run An Air Conditioner Without Electricity? 

You might be thinking, can you run an air conditioner without electricity? No is the answer. The air conditioner requires high power voltage to produce efficient cooling.

So, your false attempt to modify the connection might make you stuck in a dangerous situation. Don’t opt for such stuff without consulting the experts.

Ensure active electricity supply to relax in a cool, air-conditioned place without inconveniences of power shortage.


Do you think we’ve answered the majority of your questions about the size of the generator I need to run an air conditioner? We have made an effort to provide all the fundamental information that could have taken you hours to search for.

With the aid of this helpful buying guide, we have made it simple for you to choose the top AC generator from the best brands on the market. You don’t have to waste your time, effort, and money looking through thousands of products and brands in a congested market.

Grab a generator for your AC to enjoy the best cooling performance even if you are out of power. We are glad you made it to the final part; thanks for staying till the end. We hope you might like the other topics related to the topic. Have a good day!

Related Articles:

What Size Generator Do I Need For a Food Truck
What Size Generator Do I Need For a 3-Bedroom House

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About the author

Anthony Miller

Hello Guys! I am Anthony Miller, a high dynamo, communicative author, and editor of the Renewable Cop, always providing amazing, engaging, informative, unique, highly researched, and verified content based on all sorts of generators. Read more.

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