Can a Whole Home Generator Run Your AC?

When the power goes out, your home’s comfort and safety become top priorities. If you live in an area prone to extreme heat, one of your biggest concerns is likely whether your whole home generator can handle running your air conditioner.

So, can a whole home generator run your AC? Yes, but with the right setup. Let’s break down what you need to know about generator capacity, HVAC power requirements, and how to ensure uninterrupted cooling when you need it most.

Understanding Generator Capacity & HVAC Power Demands

A whole home generator is designed to keep essential systems running during a power outage.

But whether it can support your air conditioning system depends on two key factors:

1. The Size of Your Generator (Power Output)

   • Generators are rated in kilowatts (kW), which measure how much power they can provide at a given time.

   • A small 10-14 kW generator can typically handle lights, refrigerators, and small appliances but may struggle to run a central AC unit.

   • A 22-24 kW generator is better equipped to power larger homes, including most central air conditioners.

   • Homes with multiple large AC units may require a 30-48 kW generator for seamless operation.

     
     

2. The Power Requirement of Your Air Conditioner

   • Air conditioners vary in size, typically measured in tons (1 ton = 12,000 BTUs of cooling capacity).

   • A typical 3-ton AC unit requires about 3.5 kW to 4 kW while running but needs more power to start up (often 3-5 times the running wattage).

   • A 5-ton unit may need 6-7 kW to run and up to 30 kW for startup without soft start technology.

   
   

How to Ensure Your Generator Can Run Your AC

If you want your generator to support your air conditioning system, you need to look at these factors:

1. Choose the Right Generator Size

If you haven’t purchased a generator yet, select one based on your home’s power demands. Work with a licensed electrician to determine the best size for your needs.

2. Install a Load Management System

A load management system automatically prioritizes essential appliances, ensuring your generator doesn’t get overloaded. This allows your AC to run without shutting down other critical systems.

3. Use a Soft Start Kit for Your AC

A soft start kit reduces the surge of power needed when your AC starts up, preventing unnecessary strain on your generator. This simple upgrade can make a big difference in performance.

4. Consider Running Only Essential Appliances

During extended outages, you may need to prioritize power use. Running your AC along with refrigerators and critical systems while avoiding unnecessary high-power appliances (like electric ovens) can help your generator run efficiently.

A properly sized whole home generator can run your air conditioner, but it requires planning. Choosing the right generator capacity, using a load management system, and installing a soft start kit can all ensure your home stays cool and safe during a power outage.

At Rockwall Electric Heating and Air, we specialize in whole home generator installations and can help you determine the right setup to keep your home comfortable year-round. Contact us today to learn more about your options and schedule a consultation!