Most homes need a 14kW to 22kW whole house generator, but the right size depends on your square footage, electrical panel, HVAC system, fuel source, and the appliances you want to keep running during an outage.
For many homeowners in Canton, North Canton, Massillon, Akron, Alliance, Waynesburg, Wooster, Youngstown, and Northeast Ohio, the best generator size is determined by a professional load calculation. Smaller homes may only need essential-circuit backup, while larger homes with central air, sump pumps, well pumps, electric appliances, or EV charging may need a larger standby generator.
At Beck Electric, Generators & Plumbing, we install and service home standby generators for Northeast Ohio homeowners. As a Generac dealer, our team can help size your generator, install the transfer switch, connect the fuel source, and make sure your backup power system is ready before the next outage. Learn more about our generator services in Northeast Ohio to schedule a sizing estimate or explore standby generator options for your home.
Need help choosing the right size?
Schedule a generator sizing estimate with Beck Electric, Generators & Plumbing.
Quick Answer: What Size Whole House Generator Do I Need?
Most Northeast Ohio homes need one of these generator size ranges:
| Home Backup Goal | Common Generator Size | Best For |
| Essential backup only | 7.5kW–10kW | Refrigerator, furnace blower, sump pump, basic lights, internet, and selected outlets |
| Partial-home backup | 14kW–18kW | Essentials plus more lights, kitchen circuits, selected outlets, and some comfort loads |
| Whole-home backup | 22kW–26kW+ | HVAC, refrigerator, sump pump, well pump, kitchen loads, lighting, and more daily-use circuits |
A 14kW generator may be enough for a smaller or mid-size home with managed loads. A 22kW generator is often a better fit for larger homes or homeowners who want broader whole-home backup.
The safest answer is to have a licensed generator installer calculate your home’s actual electrical load.
Whole House Generator Sizing Calculator
Use this simple guide to estimate your generator size before scheduling a professional load calculation. For a better estimate of appliance demand, homeowners can also review the U.S. Department of Energy’s guide to estimating appliance and home electronic energy use before choosing which systems they want backed up.
Step 1: Choose Your Home Size
| Home Size | Starting Generator Range |
| Under 1,500 sq. ft. | 7.5kW–10kW |
| 1,500–2,500 sq. ft. | 14kW–18kW |
| 2,500–3,500 sq. ft. | 18kW–22kW |
| 3,500+ sq. ft. | 22kW–26kW+ |
Square footage is only a starting point. A 2,000-square-foot home with gas heat may need less backup power than a similar home with electric heat, a well pump, and central air.
Step 2: Choose What You Want to Keep Running
Essential Backup Loads
Choose essential backup if you mainly want protection for safety, food storage, heating equipment, and basic comfort.
Common essential loads include:
- Refrigerator and freezer
- Furnace blower or boiler controls
- Sump pump
- Well pump
- Basic lighting
- Internet router
- Garage door opener
- A few key outlets
Estimated size: 7.5kW–10kW for many smaller homes, depending on equipment.
Partial-Home Comfort Loads
Choose partial-home backup if you want essentials plus more comfort during longer outages.
Common partial-home loads include:
- Refrigerator and freezer
- Furnace or boiler controls
- Central air conditioning, if properly sized
- Sump pump or well pump
- Kitchen outlets
- Microwave
- More lighting circuits
- Internet and home office equipment
- Television or entertainment equipment
Estimated size: 14kW–18kW for many mid-size homes.
Whole-Home Backup Loads
Choose whole-home backup if you want the home to operate as normally as possible during an outage.
Whole-home loads may include:
- Heating and cooling equipment
- Refrigerator and freezer
- Sump pump and/or well pump
- Kitchen appliances
- Lighting circuits
- Outlets throughout the home
- Laundry equipment
- Home office equipment
- Security systems
- Medical equipment
- Specialty electrical equipment
Estimated size: 22kW–26kW+ for many larger or higher-demand homes.
Generator Size by Square Footage
The chart below gives a general planning range for residential standby generator sizing.
| Home Size | Common Generator Range | Typical Use |
| Under 1,500 sq. ft. | 7.5kW–10kW | Essential circuits, food storage, furnace blower, sump pump, lighting, internet |
| 1,500–2,500 sq. ft. | 14kW–18kW | Essentials plus added comfort loads and selected household circuits |
| 2,500–3,500 sq. ft. | 18kW–22kW | Larger homes with HVAC, kitchen circuits, sump pump, well pump, and more lighting |
| 3,500+ sq. ft. | 22kW–26kW+ | Whole-home backup, larger HVAC systems, multiple high-demand appliances, or custom load needs |
This chart should not replace a professional generator load calculation. Large electrical loads, starting watts, fuel pressure, and transfer switch design can change the final recommendation.
Appliance Load Guide for Whole House Generator Sizing
A whole house generator is sized in kilowatts, also called kW. One kilowatt equals 1,000 watts.
To estimate your generator size, you need to know two numbers:
- Running watts: The power an appliance uses while operating.
- Starting watts: The extra power needed when a motor starts.
Motors in air conditioners, refrigerators, sump pumps, and well pumps often require more power at startup than they do while running.
| Appliance or System | Typical Running Load | Sizing Note |
| Refrigerator/freezer | 600–800 watts | Startup surge should be included |
| Furnace blower | 400–800 watts | Important for winter outages |
| Sump pump | 800–1,500 watts | Critical in heavy rain and snowmelt |
| Well pump | 1,000–2,000+ watts | Startup demand can be high |
| Central air conditioner | 3,000–5,000+ watts | Requires careful sizing and load management |
| Microwave | 1,000–1,500 watts | Common comfort load |
| Lighting circuits | 300–1,000 watts | Depends on number and type of fixtures |
| Internet/router | 50–150 watts | Low load but important for communication |
| Television | 100–400 watts | Optional comfort load |
| Electric range | 3,000–8,000+ watts | High-demand load |
| Electric dryer | 4,000–6,000 watts | High-demand load |
| Electric water heater | 3,500–5,000 watts | High-demand load |
| EV charger | Varies widely | Requires professional review |
If your home has several high-demand electrical systems, your generator installer may recommend load management instead of simply installing a much larger generator.
7.5kW vs. 14kW vs. 22kW Generators
The right generator size depends on what you expect the system to do during an outage.
| Generator Size | Best For | What It Can Typically Support |
| 7.5kW | Essential backup | Refrigerator, furnace blower, sump pump, limited lights, internet, and selected outlets |
| 14kW | Partial-home backup | Essentials plus kitchen circuits, more lighting, selected appliances, and possibly central air depending on load |
| 22kW | Whole-home backup | HVAC, refrigerator, sump pump, well pump, lighting, kitchen loads, and many daily-use circuits |
Is a 7.5kW Generator Enough?
A 7.5kW generator may be enough if you only want to power critical circuits. It is usually not the best choice for full whole-home backup.
This size may work well for:
- Smaller homes
- Gas furnace systems
- Basic lighting
- Refrigeration
- Sump pump backup
- Selected outlets
It may not be enough for larger air conditioners, electric heat, electric dryers, electric ranges, or multiple high-demand loads.
Is a 14kW Generator Enough for a Whole House?
A 14kW generator may be enough for a smaller or mid-size home if the system is designed with the right transfer switch and load management.
A 14kW system may support:
- Refrigerator and freezer
- Furnace or boiler controls
- Sump pump
- Well pump, depending on size
- Kitchen outlets
- Lighting circuits
- Internet and home office equipment
- Some central air systems, depending on startup load
For many Northeast Ohio homeowners, 14kW is a strong middle-ground option when they want more than basic backup but do not need every circuit powered at once.
What Can a 22kW Generator Run?
A 22kW generator can often support broad whole-home backup, especially when paired with proper load management.
A 22kW system may support:
- Heating and cooling equipment
- Refrigerator and freezer
- Sump pump
- Well pump
- Kitchen circuits
- Lighting circuits
- Outlets throughout the home
- Home office equipment
- Security systems
- Selected laundry or appliance loads
A 22kW generator is a common option for homeowners who want the home to feel close to normal during a power outage.
Why Northeast Ohio Homes Need Careful Generator Sizing
Generator sizing matters in Northeast Ohio because outages can happen during storms, high winds, ice events, snow, heavy rain, and utility interruptions.
Local homeowners often need backup power for:
- Furnace operation during cold-weather outages
- Sump pumps during heavy rain or snowmelt
- Well pumps in rural areas
- Refrigerators and freezers during extended outages
- Medical equipment or mobility needs
- Remote work and internet access
- Air conditioning during summer outages
A home in Canton with a sump pump and gas furnace may need a different generator than a rural Waynesburg home with a well pump, propane appliances, and a larger electrical panel. That is why local sizing matters.
Why Starting Watts Matter
Starting watts are the extra watts needed when a motor turns on. They matter because a generator must be able to handle both normal running power and temporary startup demand.
Common systems with startup surge include:
- Central air conditioners
- Refrigerators
- Freezers
- Sump pumps
- Well pumps
- Furnace blowers
If multiple systems start at the same time, an undersized generator may struggle or trip. A properly designed standby generator system uses the right size generator, transfer switch, and load management strategy to keep your home powered safely. For safety planning, homeowners should also review the U.S. Consumer Product Safety Commission’s guidance on generator and carbon monoxide hazards, especially if they use any temporary or portable backup power equipment.
What Is Load Management?
Load management is a system that controls when high-demand appliances receive power during generator operation.
Instead of oversizing the generator for every appliance at once, load management can prioritize the most important systems first. For example, your generator may power the furnace, refrigerator, sump pump, and lights while temporarily delaying a central air conditioner or electric water heater.
Load management can help homeowners:
- Avoid buying more generator than they need
- Reduce overload risk
- Prioritize critical systems
- Support comfort loads more efficiently
- Keep installation practical for the home’s electrical system
Your Electrical Panel Also Affects Generator Size
Your generator does not work alone. It connects to your home through a transfer switch and must be designed around your electrical panel, circuits, and backed-up loads.
During a generator estimate, Beck Electric, Generators & Plumbing may review:
- Main electrical panel capacity
- Subpanels
- Circuit layout
- Large appliance circuits
- Transfer switch location
- Existing electrical upgrades or repair needs
- Surge protection needs
- Future EV charger plans
If your electrical panel is outdated, overloaded, or not set up for your backup power goals, you may need related electrical work before or during generator installation.
Helpful related services:
- Electrical services
- Electrical circuits
- Panel replacement
- Upgrades and repairs
- Surge protection, outlets, and switches
Do You Need a Whole House Generator or an Essential-Circuit Generator?
You need a whole house generator if you want most or all of your home to stay powered during an outage. You may only need an essential-circuit generator if your main goal is safety, refrigeration, heating equipment, and basic lighting.
Choose Essential-Circuit Backup If You Want To Power:
- Refrigerator and freezer
- Furnace blower or boiler controls
- Sump pump
- Well pump
- A few lights
- Internet equipment
- Garage door opener
- Selected outlets
Choose Whole-Home Backup If You Want To Power:
- Heating and cooling
- Kitchen appliances
- Most lighting and outlets
- Laundry equipment
- Sump pump and well pump
- Home office equipment
- Medical equipment
- Security systems
- Daily comfort systems
A professional generator installer can help you compare the cost, performance, and practicality of each option.
How Beck Sizes a Whole House Generator
Beck Electric, Generators & Plumbing uses a practical sizing process to recommend the right home standby generator.
1. Review Your Backup Power Goals
The first step is deciding what you want to keep running during an outage. Some homeowners only want essential circuits, while others want whole-home comfort.
2. Inspect the Electrical System
Your electrical panel, circuits, transfer switch location, and existing wiring all affect the installation plan.
Related services may include:
3. Calculate Electrical Loads
The technician reviews running watts, starting watts, HVAC equipment, pumps, appliances, and high-demand circuits.
4. Review Fuel Source
Standby generators commonly use natural gas or propane. Fuel availability and pressure can affect the final installation design.
5. Recommend the Generator and Transfer Switch
The final recommendation should include the generator size, transfer switch setup, load management plan, installation details, and maintenance considerations.
What If You Have an EV Charger?
An EV charger can significantly affect generator sizing because it may add a large electrical load to the home.
If you already have an EV charger or plan to install one, mention it during your generator estimate. Your installer can determine whether the EV charger should be backed up, excluded from generator power, or managed separately.
Learn more about Beck’s EV charger installation services.
Why Work With a Generac Dealer?
A standby generator is not a plug-in appliance. It is a permanent backup power system that must be sized, installed, connected, tested, and maintained correctly.
Working with a Generac dealer can help ensure your system is designed for your home’s actual needs.
Beck Electric, Generators & Plumbing can help with:
- Generator sizing
- Generac standby generator recommendations
- Residential generator installation
- Transfer switch installation
- Electrical permitting and code-compliant work
- Natural gas or propane coordination
- Startup testing
- Generator maintenance and service
Explore Beck’s generator services:
- Generator services
- Residential generator installation
- Commercial generator installation
Should You Install a Generator Before the Next Storm Season?
Yes, it is usually better to install a standby generator before storm season instead of waiting until outages become frequent.
Generator installation can involve sizing, permitting, equipment selection, transfer switch installation, fuel connections, and inspection. Planning helps you avoid emergency decisions and gives your home reliable backup power before the next extended outage.
In Northeast Ohio, homeowners often think about generators after:
- Repeated utility outages
- Storm-related power loss
- Basement flooding from sump pump failure
- Food loss from refrigerator or freezer shutdown
- Home office disruptions
- Medical equipment concerns
- Heating or cooling interruptions
If any of those issues apply to your home, a generator sizing estimate is a smart next step.
Schedule a Whole House Generator Sizing Estimate in Northeast Ohio
The best way to answer “what size whole house generator do I need?” is to have your home professionally evaluated.
Beck Electric, Generators & Plumbing helps homeowners across Canton and Northeast Ohio choose, install, and maintain reliable standby generator systems. Our team can review your electrical panel, calculate your backup power needs, recommend the right generator size, and complete a safe installation.
Whether you need essential backup or whole-home power, we can help you choose the right system for your home. To get a professional recommendation for your home, contact Beck Electric, Generators & Plumbing to schedule a generator sizing estimate.
Frequently Asked Questions About Whole House Generator Sizing
What size whole house generator do I need for a 2,000-square-foot home?
Many 2,000-square-foot homes need a generator in the 14kW to 18kW range, but the right size depends on HVAC equipment, appliance loads, sump pump or well pump needs, and whether you want essential backup or whole-home backup.
Is a 22kW generator enough to run a whole house?
A 22kW generator can often run many whole-home loads, including heating and cooling, refrigeration, lighting, outlets, sump pump, well pump, and kitchen circuits. The final answer depends on your home’s electrical loads and transfer switch design.
Can a 14kW generator run central air conditioning?
A 14kW generator may run some central air systems if the air conditioner size, startup load, and load management setup are compatible. Larger AC systems or homes with multiple high-demand appliances may need a larger generator.
What size generator do I need for a sump pump and refrigerator?
A smaller essential-load generator may be enough for a refrigerator, sump pump, furnace blower, lights, and selected outlets. Many homes with this goal fall in the 7.5kW to 10kW range, but startup watts must be included.
Do I need a transfer switch for a whole house generator?
Yes. A transfer switch safely connects the generator to your home’s electrical system and prevents unsafe backfeeding into utility lines. Standby generator installation should always be handled by qualified professionals.
Is natural gas or propane better for a standby generator?
Both natural gas and propane can work well. Natural gas is convenient when available, while propane is common for homes without natural gas service. Your installer can review fuel availability, pressure, tank needs, and generator requirements.
Can I add a generator if my electrical panel is old?
Possibly, but your panel may need repairs, upgrades, or replacement before the generator can be installed safely. A generator estimate should include a review of your electrical panel and backed-up circuits.
How much generator capacity do I need for an EV charger?
EV chargers can add a large electrical load. In many cases, the EV charger is excluded from generator backup or controlled through load management. If you have or plan to install an EV charger, mention it during your generator sizing estimate.
