Short answer: a portable generator is a tool you operate — cheaper, but it needs someone home to start and refuel it, and it will not run central air. A standby generator is part of the house — it starts itself within seconds, runs on natural gas or propane, and can carry the whole home. Portable suits short rare outages. Standby suits multi-day outages, wells, and anyone who cannot be there to run it.
If you are researching backup power for the first time, this is usually the first real fork in the road. Here is the honest comparison.
Side by side
| Portable | Standby | |
|---|---|---|
| Typical cost | Hundreds to low thousands | $9,500–$16,000 installed |
| Starts automatically | No | Yes, within seconds |
| Requires someone home | Yes | No |
| Fuel | Gasoline, refuel every few hours | Natural gas or propane |
| Runs central air | Rarely | Yes, if sized for it |
| Runtime | Until you run out of gas | Days, or indefinitely on natural gas |
| Noise | Louder, no enclosure | Comparable to an AC unit |
| Permit required | No, if using cords | Yes |
| Carbon monoxide risk | Significant if misused | Managed at install |
| Moves with you | Yes | No |
| Adds to home value | No | Yes |
The short version
A portable generator is a piece of equipment you own and operate. You store it, roll it out when the power goes down, fuel it, and run extension cords or a manual interlock to whatever you want powered.
A standby generator is part of the house. Permanently installed on a pad outside, wired into your electrical panel, connected to natural gas or propane, and it starts by itself within seconds of an outage whether you are home or not.
Portable is a tool. Standby is infrastructure.
The differences that actually decide it
It has to work when you are not there
This is the one that settles it for most people who end up going standby. A portable requires someone home, awake, physically able, and willing to go outside and start it.
If the outage starts at 3 a.m., if you are travelling, if a family member is home alone, if someone depends on medical equipment, or if you simply do not want to be hauling a generator out in a thunderstorm — a portable does not solve the problem you actually have.
Fuel and refueling
A portable running a partial load burns through gasoline steadily and needs refueling every several hours. In a multi-day outage that means fuel stored in advance, or trips to a station that may have no power and no working pumps.
Standby units run on natural gas from the utility line, which does not run out, or on a propane tank sized for days rather than hours. Nobody is standing in a fuel line. More on fuel choice.
Gasoline also degrades in storage. Propane and natural gas do not, which matters for fuel that might sit unused for a year.
Carbon monoxide
Worth being blunt. Portable generator carbon monoxide poisoning kills people in this country every storm season, almost always because a unit was run in a garage, on a porch, near an open window, or under an overhang.
A standby generator is permanently sited a safe distance from the house with exhaust directed away, and that decision is made once, by a licensed installer, at install. There is no opportunity to make the wrong call at 2 a.m. in the rain.
If you do use a portable: outside only, well away from the house, never in a garage even with the door open, and install CO alarms.
What actually gets powered
Portables handle a refrigerator, some lights, phone charging, maybe a window unit. Central air conditioning is typically out of reach — and in a Texas summer outage, that is the thing you actually want.
A properly sized standby unit can carry central air, well pump, kitchen, and the rest of the house. Sizing guide.
Permits and code
A portable used with extension cords needs no permit. A standby generator is a permitted electrical and often gas job, inspected, with a transfer switch that legally isolates your house from the grid.
That sounds like a downside. It is actually a protection — the inspection exists to catch mistakes that could burn the house down or energize a line someone is working on. How permits work here · What a transfer switch does.
Never back-feed a portable generator through a dryer outlet. It can energize utility lines and kill a lineworker. If you want to power circuits from a portable, use a proper interlock kit or manual transfer switch installed by an electrician.
Noise and convenience
Portables are loud, sit close to the house because cords are short, and you hear them all night. Standby units are quieter, sited further out, and run a brief weekly self-test you barely notice. How loud each actually is.
Home value and resale
A permanently installed whole-home generator is a documented feature of the house. A portable goes in the moving truck.
When a portable is genuinely the right call
We install standby generators, so take this in context — but a portable is a reasonable choice if:
- Outages where you live are short and rare
- You need to power a handful of essentials, not the house
- You want something you can also take camping or to a job site
- Budget is the binding constraint and you want some coverage rather than none
- You are renting, or expect to move soon
There is nothing wrong with a portable used correctly. Plenty of households are well served by one.
When standby is the right call
- Outages in your area run long, or come with storms
- You have central air you actually need running
- Anyone in the house relies on powered medical equipment
- You travel, or the house is sometimes empty
- You have a well pump, septic pump, or livestock water
- You do not want the outage to become a project you personally manage
More on whether you need one at all.
The middle option people miss
You do not have to power the entire house. A smaller standby unit paired with an essential-circuits transfer switch, or with load management, covers what matters for meaningfully less than whole-home coverage.
That is often the right answer for households who assumed standby was out of reach on price. Worth getting a number before ruling it out. Cost breakdown.
Frequently asked questions
Can I use a portable generator to power my whole house?
Not realistically, and not safely without a properly installed interlock or transfer switch. Never back-feed through an outlet.
How long can a standby generator run continuously?
On natural gas, effectively as long as the outage lasts, with oil checks on very long runs. On propane it depends on tank size and load.
Do standby generators need maintenance?
Yes, annually or by run hours. It is the main factor in how long the unit lasts. Maintenance schedule.
Is a standby generator worth it if outages are rare?
That is a judgment call about risk tolerance rather than a technical question. You are buying protection against the outage you cannot predict.
How much does each cost to run?
A portable burns gasoline you buy by the can. A standby on natural gas draws from the utility, which is generally the cheaper fuel, though a standby runs few hours in a normal year either way.
Can I start with a portable and upgrade later?
Yes, and plenty of people do. The portable retains resale or secondary use value, unlike most home upgrades.
Not sure which way to go?
We will look at your house, your outage history, and what you actually need running, then give you a real number. If a portable is the better fit for your situation, we will say so.
Call 281-259-2182 · Serving Montgomery, Waller, and Grimes counties and the greater Houston area