Whole House Generator

A whole house generator is a permanently installed backup power system that automatically kicks on during outages, keeping your lights, HVAC, refrigerator, and essential appliances running seamlessly. These units run on natural gas or propane and require proper sizing, electrical work, and local permits for safe installation. Angi helps you connect with pros who can guide you through selection, installation, and maintenance.
Whole House Generator Service Articles and Advice
Alison Kasch  •  Apr 16, 2026
How Much Does It Cost to Run a Standby Generator?
How much does it cost to run a standby generator? The answer varies based on the type and size of the generator. Find out more.
Rachel Presser  •  Apr 10, 2026
Do Pellet Stoves Need Electricity and Can You Operate Them During a Power Outage?
Do pellet stoves need electricity? Yes, they do, despite burning wood to heat your home. We'll show you how to keep your pellet stove going in power outages.
Tyler Lacoma  •  Apr 10, 2026
Best Fuel For a Whole-House Generator: 5 Options
If you’re investing in a large power alternative for your home, it deserves the right fuel for your job. Here are the top options for a whole home generator.
Michelle Nati  •  Apr 10, 2026
Can a Whole-House Generator Run an Air Conditioner?
A whole house generator can keep your home running during a power outage, but can it handle the energy demands of an air conditioner? Here’s what to consider.
Tyler Lacoma  •  Apr 10, 2026
How Do Natural Gas Generators Work?
Natural gas generators can tap into existing gas lines so they never run out of fuel. Here’s how they work and how they’re used.
Tyler Lacoma  •  Apr 10, 2026
How Do Whole-House Generators Work?
Whole house generators are a power alternative that can deal with frequent blackouts and other problems. Here’s how they function.
Melissa Graham  •  Apr 10, 2026
How Long Can a Whole-House Generator Run Continuously?
The type of generator and its fuel source can make the difference between whether it provides temporary relief of long-term comfort. Find out how long a whole house generator can run continuously.
Melissa Graham  •  Apr 10, 2026
How Much Propane Does a Whole-House Generator Use?
When the power goes out, your whole house generator can keep your home running if it has enough propane to fuel it. Read our guide to propane use for whole house generators to determine how much you need.
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Common Whole House Generator Service Questions

Whole-house generators need to be installed on level ground several feet away from walls and other objects. Because they tap into the electrical system directly, they usually need to be close to your home electrical panel for a transfer switch installation. It also helps with installation if they are near to a gas line or propane tank installation.

It’s a bad idea to refuel a whole-house generator while it’s running. Trying to fill a running generator is difficult and increases the risk of a fire or explosion. Instead, the recommended procedure is shutting down the generator, switching off your electrical system, then refilling it before turning it all back on. For whole-house generators, that means picking the right time when no household activities will be interrupted.

An undersized whole-house generator has the potential to overheat and shut down when you try to run a central AC system. This scenario can not only damage the whole-house generator, but can also trip your home’s breakers or cause electrical damage. To avoid this situation, hire a local generator installer to correctly size your whole-house generator.

To power a central air system during a power outage, the whole-house generator will need to be at least 5,000 watts, and this number will significantly increase for larger units. Check the specific wattage requirements of your AC unit to choose the right generator size. Consider consulting a generator installer to ensure your whole-house generator meets your electrical load needs.

In some cases, yes. You can get dual or triple-fuel capable generators, although you may need a conversion kit to switch between fuels, so it’s not as easy as flipping a switch. For example, many manufacturers offer whole-house generators that work with natural gas or propane with the right preparation.