A Generac home standby generator is a permanently installed, whole-home power backup system that starts automatically when your utility power fails and shuts off when it returns, with no action required from you. IB Lighting carries the full Generac Next Generation lineup from 22,000 to 28,000 watts, covering both standard generator-only configurations and models that include a 200-amp automatic transfer switch. This guide covers every model, explains the differences between wattage tiers, and helps you choose the right configuration for your home and electrical service.

Generac Home Standby Generator 22kW, 24kW, 26kW and 28kW: Complete Buyer’s Guide

Unlike portable or temporary solutions, these units are liquid propane or natural gas fed generators designed for a fixed outdoor installation, sized to power a medium to large American home without load restrictions or compromise. If you have questions about sizing or installation requirements before ordering, our team includes a licensed Master Electrician available to assist. Contact us here.

What Is the Generac Next Generation Series?

The Generac Next Generation lineup is the current production line of air-cooled residential standby generators from Generac Power Systems, one of the leading names in home backup power in North America. It replaced the previous Evolution series and introduced an updated G-Force engine platform engineered specifically for standby applications, not adapted from portable generator designs.

Every Generac home standby generator in the 22kW to 28kW range runs on dual fuel: liquid propane (LP) or natural gas (NG), connected to a permanent supply. The unit monitors your utility power continuously, and when an outage is detected it starts automatically, restoring power to your home within approximately 10 seconds. Once utility power returns, it transfers load back and shuts down on its own. In addition, all models share True Power Technology for clean, stable electricity output, a corrosion-resistant aluminum enclosure, and an integrated diagnostic control panel.

Complete Model Lineup: 22kW to 28kW

IB Lighting carries seven configurations of the Generac home standby generator in the 22kW to 28kW range. Each wattage is available in a generator-only version and, in most cases, a bundled version that includes a matched 200-amp automatic transfer switch.

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The Generac 22kW home standby generator is one of the most widely installed whole-home backup units in the United States. At 22,000 watts it delivers enough capacity to power a home in the 2,000 to 2,800 square foot range under full load, including central air conditioning, a well pump, refrigerators, lighting, and most major appliances simultaneously.

In practice, this output level is the entry point for whole-home coverage in climates where air conditioning is a significant load. Homes with gas appliances such as a gas range, gas water heater, or gas furnace can often run comfortably on this unit because the heaviest electrical demands are already handled by the gas supply. However, all-electric homes should evaluate the total connected load carefully before choosing this wattage tier.

What Can a 22kW Standby Generator Power?

A 22kW unit can run a typical 2,000 to 2,800 sq ft home with central air conditioning up to 5-ton, a well pump up to 1.5 HP, a refrigerator and freezer, standard kitchen appliances, whole-home lighting, a sump pump, and entertainment systems. However, it is not the recommended choice for homes with multiple central AC units running simultaneously or homes with large electric water heaters and heat pumps operating at the same time.

The Generac 24kW home standby generator sits at a practical sweet spot for homes in the 2,500 to 3,200 square foot range. Specifically, the 2,000-watt increase over the 22kW model provides meaningful headroom when large loads cycle on, particularly central air conditioning compressors, which draw heavy startup current before settling at their running load.

Additionally, homeowners with electric vehicle chargers, hot tubs, or larger HVAC systems will find that the 24kW output accommodates more simultaneous demand without risking overload. IB Lighting carries two variants: the Model 7261 (generator only) and the Model 7326, which ships with a 200-amp automatic transfer switch included.

Who Should Buy the 24kW Model?

The 24kW configuration is the right choice for homeowners who need more capacity than a 22kW unit provides. It is particularly well-suited to homes with a heat pump HVAC system, a 240-volt EV charger, or a home office with server or networking equipment that draws consistent load on top of standard household demand. The Model 7326 with ATS is the most convenient option for most buyers because it eliminates a separate transfer switch purchase and ensures full compatibility between the generator and switching equipment.

The Generac 26kW home standby generator is designed for larger homes and households with above-average electrical demand. At 26,000 watts, this output level is capable of powering a home up to approximately 3,500 to 4,000 square feet, including multi-zone HVAC systems, a full electric kitchen, a swimming pool pump, and whole-home lighting without load shedding.

Furthermore, this is the size range where homeowners with older all-electric homes find the coverage they need without compromise. For example, an all-electric home of 2,500 to 3,000 square feet will draw significantly more generator load than a gas-hybrid home of the same size, making the 26kW Generac home standby generator the safer sizing choice in those situations.

22kW vs 26kW: Which Output Level Is Right for Your Home?

The decision between a 22kW and a 26kW Generac home standby generator comes down to your home’s total electrical load and how much of it you want covered during an outage. If your goal is whole-home coverage with no load management, and your home is larger than 2,500 square feet or has an all-electric appliance setup, the 26kW is the more appropriate choice. By contrast, the 22kW is well-suited for smaller homes or homes where gas appliances handle the major thermal loads. As a general rule, choosing the larger unit is rarely a mistake, because undersizing a standby generator is a common and costly error.

The Generac 28kW home standby generator is the highest-output air-cooled residential model in the standard Next Generation lineup. It is the correct choice for large homes above 3,500 square feet, homes with dual-zone central air conditioning, properties with workshop or garage equipment, and any application where the homeowner wants maximum headroom and zero compromise during an extended outage.

The 28kW also makes sense as a forward-looking investment. Adding an EV charger, a hot tub, or a home addition several years from now will not require generator replacement if the original installation was sized at 28kW from the start. This Generac home standby generator configuration is the most capable permanently installed air-cooled residential unit available in the Next Generation series.

Is the 28kW Model Worth the Investment?

For homeowners committed to full whole-home backup power with no restrictions, the 28kW Generac home standby generator delivers the most coverage available in an air-cooled residential unit. The incremental cost above a 26kW model is modest relative to the total project cost of a permanent generator installation. For any home above 3,200 square feet, or any homeowner who does not want to think carefully about what is running during an outage, the 28kW is the correct choice.

Automatic Transfer Switch: Do You Need One?

Every permanently installed Generac home standby generator requires a transfer switch. The transfer switch is the critical component that disconnects your home from the utility grid and connects it to the generator. Without it, the generator cannot safely power your home, and utility workers repairing power lines would be exposed to back-fed electricity, which is both illegal and dangerous.

With ATS vs Without ATS: Which Configuration Should You Buy?

If you do not already have a compatible transfer switch installed, the bundled ATS configuration is the most practical and typically the most cost-effective option. Buying the Generac home standby generator and transfer switch as a matched set ensures full compatibility and simplifies the installation process for your electrician. However, if you already have a transfer switch installed, or if your electrician is specifying a different switching solution, the generator-only models are the appropriate choice. Contact our team if you need guidance on which configuration fits your existing electrical setup.

How to Size a Standby Generator: Choosing the Right Wattage

Sizing a Generac home standby generator correctly is about matching the generator output to your home’s peak electrical demand, not simply choosing the largest unit you can afford. The following guidance reflects general sizing principles based on home type and square footage.

• 22,000 Watts: Homes up to approximately 2,500 sq ft with gas appliances. Single-zone HVAC. Central AC up to 4-ton. Well pump up to 1.5 HP.
• 24,000 Watts: Homes of 2,500 to 3,000 sq ft. Mixed gas and electric appliances. Heat pump systems. Moderate EV charging load.
• 26,000 Watts: Homes of 2,800 to 3,500 sq ft. All-electric appliance configurations. Larger HVAC. Pool pump. Workshop equipment.
• 28,000 Watts: Homes above 3,200 sq ft. Dual-zone HVAC. All-electric with no load compromise. Future-proof sizing for planned additions or equipment upgrades.

However, these ranges are estimates. The only accurate way to size a Generac home standby generator for your specific property is to calculate your connected load, identify the largest motor loads in your system, and apply an appropriate safety margin. As a result, our team can walk through this with you before you order. Reach us here.

Natural Gas vs Liquid Propane: Which Fuel Should You Choose?

All models in this lineup run on both natural gas and liquid propane. Fuel selection is made at installation and cannot be changed afterward without a conversion kit. If your home has a utility natural gas line, natural gas is the standard choice because the supply is continuous and not dependent on a tank level. For homes in rural areas without utility gas service, liquid propane stored in an on-site tank is the standard alternative. Your installer will size and connect the fuel supply line as part of the installation process.

Why Buy from IB Lighting?

IB Lighting is a family-owned business with a licensed Master Electrician on staff. When you call us at (800) 674-9019 or send a message through our contact page, you reach people who understand what you are buying. As a result, generator sizing, transfer switch compatibility, and installation questions get real answers, not a sales script.

• Free Freight Insurance: Every Generac home standby generator ships with freight insurance included. If your unit arrives damaged, we handle it.
• Nationwide Delivery: We ship to all 50 states. Generators in this weight class ship on freight and we coordinate that process for you.
• Manufacturer Warranty: All products carry Generac manufacturer warranty coverage, provided with your order documentation.
• No Sales Tax in Select States: Depending on your delivery address, no state sales tax may apply. Tax is calculated accurately at checkout.
• MAP-Compliant Pricing: Generator prices are shown at checkout in compliance with Generac manufacturer advertising policies. You see the real price before placing your order with no hidden fees.

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