Home systems projects · Generators & backup power
Generators and backup power for your home
Backup power is not about comfort during a storm. It is about protecting the systems that keep your house healthy when the lights go out.
Most people shop for a generator the week after a bad outage, which is exactly when prices are worst and thinking is fuzziest. The better move is to decide in calm weather what actually needs to stay on in your house, then buy the smallest system that covers it. That list is usually shorter than you think: heat, refrigeration, a sump pump if you have one, a well pump if you have one, and a few circuits of lights and outlets.
The market wants to sell you a whole-home standby unit. Sometimes that is the right answer. Often a good portable generator with a properly installed transfer switch, or a battery system, covers everything that matters for a fraction of the cost. This guide walks through the real choices so you can size the solution to the risk instead of the fear.
01Why backup power is a property decision, not a gadget decision
Public records show 21% of lots are an acre or larger, and the median lot is 0.389 acres. Larger lots and spread-out homes mean more wire per household, longer runs through trees, and, when a storm hits, more repair points between you and restored power. The homes with the most land are often the ones that wait longest, and they are also the ones most likely to depend on a private well pump and an electric heating loop that stop the moment the line drops.
There is a second reason to take this seriously. Public records show the building typically carries about 60% of a home's assessed value, and an extended winter outage threatens exactly that part. Frozen pipes, a flooded basement with a dead sump pump, a heating system down for days: backup power is less a convenience purchase than an insurance policy on the most valuable thing on the lot.
These are the statewide numbers. Your address has its own: the year and story of your exact home, its value as a dated range, what your lot allows, and what it could earn. Free to download.
See your address in the app →02Portable vs standby: the real tradeoff
A portable generator is cheap, flexible, and manual. When the power drops, you roll it out, start it, and plug in through a transfer switch. It asks something of you in the worst weather, and it only works if someone is home. A standby generator is the opposite bargain: it sits on a pad, tests itself weekly, and starts on its own within seconds of an outage, whether you are home or not. You pay for that autonomy, typically several times the cost of a portable setup once installation is included.
The deciding question is not budget, it is presence. If you travel, own a second home, or have a basement that floods without a sump pump, automatic start is worth real money. If you are usually home and your risks are comfort and food spoilage, a portable unit does the job.
03Sizing: power what matters, not everything
Generator sizing goes wrong in one direction: too big. Add up the actual loads you need through an outage. A furnace fan, a refrigerator, a sump pump, and some lights can often run on a modest portable unit. Well pumps and electric water heaters demand more, and anything with a big motor needs extra capacity to start.
A licensed electrician can run the numbers from your panel in an hour. Skipping that step is how people end up with a machine twice the size they need, burning twice the fuel, or one too small that trips the moment the well pump kicks on.
04Transfer switches: the non-negotiable piece
Never connect a generator to your house through a dryer outlet or any other backfeed trick. It can kill a line worker restoring power on your street and it can destroy your equipment when the grid comes back. A transfer switch or interlock physically separates your house from the grid before the generator connects. It is the one part of this project with no cheap workaround, and it is licensed electrical work everywhere.
05Batteries: the quiet alternative
Home battery systems have become a genuine third option. They are silent, they need no fuel, they switch over instantly, and paired with solar they can recharge through a multi-day outage. Their limits are honest ones: capacity. A battery that carries your essentials overnight may not carry electric heat for days. They shine for short outages, for homes with solar, and for people who cannot or will not deal with engines and fuel.
06Fuel: what you can actually store
Gasoline is everywhere and goes stale within months, and the stations near you may be dark in the same outage. Propane stores indefinitely in tanks you control, which makes it the practical choice for standby units where natural gas is not available. Natural gas, where you have it, means never thinking about fuel at all. Match the machine to the fuel you can realistically keep on hand, not the fuel that looks cheapest per hour.
07What should drive your decision
Before you price a single machine, get clear on how your house actually fails without power. The right system for a home on a well with electric heat is completely different from the right system for a gas-heated house in a village center.
- Presence: if the house is regularly empty, automatic start moves from luxury to requirement.
- Water: a private well means no water at all without power, which changes the sizing math.
- Basement: an active sump pump is the strongest single argument for automatic backup.
- Heat type: gas and oil systems need only a small electrical load to run; electric heat needs serious capacity.
- Fuel reality: what can you store, refill, and start in a week-long winter event, not a two-hour blip.
- Noise and neighbors: standby units run loud during outages and weekly tests; siting matters on small lots.
- Solar: if panels are on your roadmap, price a battery before committing to an engine.
Running a portable generator and maintaining fuel is homeowner territory. Everything between the generator and your panel is not. Transfer switches, interlocks, standby installation, and any panel work are licensed electrical work, and the gas connection for a standby unit is licensed gas fitting. This is one project where the pro is not optional, because the failure modes include backfeeding the grid and carbon monoxide. Never run any generator in a garage or near windows, even with the door open.
- Any quote that connects a generator without a transfer switch or interlock. Walk away.
- Standby units sized for the whole house when you only need essential circuits. That is the single most common overspend.
- Portable generators placed too close to the house. Carbon monoxide deaths in outages are almost always placement errors.
- Stale gasoline. A generator that sat two years with old fuel often will not start the night you need it.
- Skipped maintenance contracts on standby units. A machine that never runs still needs oil, battery, and exercise cycles.
08What it typically costs
The spread on these numbers comes from three things: how many circuits you back up, how far the unit sits from your panel and fuel source, and whether your panel needs work to accept a transfer switch. Fuel type moves standby costs too, since propane installs add tank and line work that natural gas homes skip. Get the load calculation done first; it is the cheapest line item and it controls every other number.
Broad national planning ranges as of 2026, not quotes or offers. Local prices vary widely; get multiple written estimates for your own home.
National ranges size the project. The app sizes it to your home: your value band, your town's market, and the pros near you competing with real quotes.
Size it to your home →09The short version
Backup power rewards people who decide before the storm, not after it. Start from what your house cannot survive without, size to that, and treat the transfer switch as sacred. A whole-home standby unit is not a better answer than a portable one, and a battery is not a compromise. A project is not good or bad on its own, it fits your plans or it does not, and the right backup system is the one matched to how your particular house fails in the dark.
Who does the work
The trades this project usually touches. Tap one for the full hiring guide.
Size this project to your home.
Wiew shows your address's value as a dated range and puts projects like this in context, scored to your money and plans. The pros who do the work are in the app too.
This guide is educational information, not a quote, an offer, an appraisal, or legal advice. Cost figures are broad national ballparks for planning only; real prices vary widely by region, home and scope, and change over time. Assessed values are the public record's tax-cycle figures, not market prices. Building and permit rules vary by municipality. Confirm project specifics with your local building department and licensed professionals.