10 Best Whole House Generators 2026 in the United States

The Generac 7210 24kW Air Cooled Guardian Series Home Standby Generator is designed to offer reliable power for residential use during outages. With a noteworthy power output of 24,000 watts, it ensures that even larger homes can stay powered, making it a strong candidate for whole-house protection. One of its standout features is the 200-amp automatic transfer switch, which ensures seamless power switching, allowing for uninterrupted service during outages. Additionally, the Smart Controls and Mobile Link Wi-Fi connectivity enable users to monitor the generator’s performance remotely, which is a big plus for peace of mind.

The generator operates on natural gas or LP gas, offering flexibility based on user preference. With Generac’s True Power Technology, the generator promises clean and stable power, minimizing the risk of damage to sensitive electronics. The 5-year limited warranty adds an extra layer of reassurance regarding the product's reliability and long-term performance.

Potential buyers should consider a few drawbacks. The generator's weight of 455 pounds could pose challenges during installation, which requires a certified electrician. Additionally, its size may not be suitable for all outdoor spaces, requiring ample installation area.

The Generac 15,500-Watt Portable Generator is a strong option for those wanting backup power for their entire home or large job sites. Its high power output of 15,500 running watts means it can handle multiple appliances and essential systems simultaneously. Fueled by gasoline with an efficient 816cc electronic fuel injection engine, it offers cleaner fuel use and dependable starts. The 5-gallon fuel tank provides around 11 hours of runtime, which is solid for extended outages.

Safety is addressed with built-in COsense technology that alerts users to dangerous carbon monoxide levels, adding an important layer of protection. Although it doesn’t include an automatic transfer switch (ATS) out of the box, it is compatible with transfer switches, allowing easy integration for seamless power transfer during outages. The generator is quite heavy at 450 pounds and fairly large, so it’s best suited for users who have space and can manage its size. Its rugged build with covered outlets and sturdy wheels makes it durable and easier to move than most generators this powerful.

One minor consideration is the noise level, as large gas generators like this are typically loud, which may be a factor if you have noise restrictions. This generator is a reliable, powerful choice for whole-house backup, especially if robust performance and built-in safety features are priorities, though it may require professional installation and sufficient space to operate comfortably.

The Generac Guardian 26kW Home Standby Generator is a strong choice for homeowners looking to power an entire house during outages. With a solid power output of 26,000 watts, it can handle most household appliances and systems easily. It runs on natural gas or propane, which are common and convenient fuel options for standby generators. The included 200 Amp automatic transfer switch ensures your home switches over to generator power automatically and safely without manual effort.

One highlight is the WiFi-enabled remote monitoring, allowing you to check status and receive maintenance alerts from anywhere, adding convenience and peace of mind. The generator is housed in a durable aluminum casing that’s built for outdoor use and designed to run quietly, which is helpful if noise is a concern in your neighborhood. Installation requires a licensed electrician, which is typical for whole-house units but adds to initial setup cost and complexity.

Weighing 518 pounds and measuring about 4 feet long, it’s a sizable unit but fairly compact for the power it delivers. Backed by a 5-year warranty and supported by Generac’s reputation, this generator delivers reliable, low-maintenance performance for whole-house backup. For those seeking consistent, automatic power and remote monitoring with a well-regarded brand, this model is a suitable fit, though professional installation is recommended.