Is a Whole House Generator Worth It?

When is a whole-house generator worth it?

A whole-house generator — also called a standby generator — will set you back between $10,000 and $25,000, on average, with prices sometimes climbing over $55,000. However, generators are convenient because you won’t likely experience power interruptions during blackouts if you have one. But $10,000 to $25,000 can be a high price to pay for convenience.

A whole-home generator can add value to your home, but in most cases you won’t recoup the entire upfront cost in resale value. So, from a financial perspective, whole-home generators usually aren’t worth it. That said, they can save you more money than they cost by protecting against damage to your home or the loss of food and medications if there is an outage.

And there are cases where the cost is justifiable even if the unit doesn’t save you money. If any of the following apply to your situation, installing a whole-home generator might be a good idea.

• If you need medical power: You or someone in your home relies on electricity for life-saving medical equipment, or for refrigeration for necessary medication.
• If outages are common: Your city or region experiences frequent power failures, or grid instability in your area means outages last for long periods.
• If temperatures are extreme: You live in an extreme climate and rely on electricity to keep your home at a safe temperature.
• If freezing is a concern: Your home is at high risk of frozen pipes during an outage due to cold weather.
• If flooding is a risk: You live in a flood-prone area and rely on a sump pump to prevent your basement or crawl space from flooding.
• If you work from home: You work from home and could face income loss during blackouts.
• If you want peace of mind: You want the peace of mind that comes with never having to worry about power interruptions, especially during emergencies.
• If you're preparing to sell: You live in a more extreme climate and are considering installing a whole-home generator to boost your home value before selling.

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Whole-house generator costs and value

The average price of a whole-house generator is between $10,000 and $25,000, but your total out-of-pocket costs could fall anywhere from $4,500 to $56,900, depending on a few key factors.

Here’s a breakdown of the core material and labor fees you should expect.

You’ll pay installation and permit fees, in addition to the cost of the generator itself, for most installation projects. But there are other potential costs to consider. Depending on your home and installation needs, you may also need to budget for additional expenses.

What affects the cost of a whole-home generator?

The table below provides a preview of additional factors that can affect the total cost of your standby generator.

The total cost of a whole-home generator can vary significantly depending on your home and installation needs, and even your location. For example, an older electrical panel may need an upgrade to handle the generator’s output, while homes without an existing gas line may require additional fuel-line installation.

Site preparation can also add to the bill, particularly if your installation area is difficult to access or sits on a steep slope. And while maintenance is a smaller ongoing expense, budgeting for annual professional service can help keep your generator reliable during an outage.

Whole-house generator sizing for your home

Since the upfront cost of a whole-home generator largely depends on the unit size, and because the installation cost is a key part of determining the value of a standby generator, it’s a good idea to determine what size generator you need.

Have a professional size your generator to ensure power to all appliances and systems during an outage.

It’s always best to have a professional size your system for you, as the process is complicated and mistakes can mean insufficient power during an outage. However, you can use the tips below to get an idea of what size generator will work for your home.

1. Figure out what you need power for

Some homeowners just want to run their refrigerator and lights on emergency backup power to prevent food spoilage and feel safe. Others want minimal interruption to their daily routine, which means powering HVAC equipment, pool pumps, appliances, EV chargers and more.

Assess the running power of everything you want to use during an outage.

2. Consider what you need to work at the same time

Your generator will bear heavier loads when you run multiple appliances or devices at the same time. Think about which items in your home you’ll want to run simultaneously, and add up the running wattages to get a minimum generator size.

3. Plan for starting loads

Appliances and devices that use compressors and pumps require a surge in power when they kick on, sometimes two to six times their normal running wattage. These include refrigerators, chest freezers, pool pumps and many types of HVAC units, including central ACs.

You can get the starting load from the manual or faceplate on some appliances, but you can also multiply the running load by between two and six to estimate the starting load.

4. Calculate a baseline generator size

Next, determine what you’ll want to run simultaneously and add in those starting loads for anything that might turn on during an outage. This will give you a baseline size that will power your home through a blackout.

5. Oversize your unit to account for errors

Finally, add 20% to the generator wattage as a buffer to avoid issues stemming from miscalculation. Don’t oversize too much, as this can lead to an unnecessarily high unit cost and fuel waste.

Generally speaking, generator size fluctuates with home size since larger homes tend to have bigger HVAC systems, more appliances and more demand on the electrical system. For oversized and luxury homes, you may see a disproportionately high generator cost if you need a larger, liquid-cooled unit as opposed to a traditional air-cooled model.

Standby vs. portable generators

While standby generators offer outstanding utility, they’re usually the most expensive types of generators. If you want some backup power during outages but can’t justify the cost of a whole-home generator, a portable generator might be a good option to consider.

Standby generators are more convenient because they turn on automatically and can power your entire home, so you may not even notice when there’s a blackout.

Portable generators require manual fueling and starting. They’re less convenient, but they’re also a fraction of the cost, meaning they’re more likely to be worth the investment.

Here’s a breakdown of how portable generators and standby generators work, and how they stack up against one another.

Overall, standby generators are more convenient and are ideal for whole-home backup, but a portable generator makes more sense if you just need emergency power for specific appliances or devices — or if you don’t believe the high cost of a whole-home unit is worth it.

FAQ

Bottom line

Deciding if a whole-house generator is worth it comes down to your risk tolerance and needs. Start by asking: How often do you lose power, and what are the consequences if you do?

For most homeowners, a standby generator is a costly convenience. But if outages threaten your safety, health or income — or you simply can't afford long interruptions — a whole-house generator can be a practical investment. Weigh the real-world impact of blackouts against the high upfront cost before committing.