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Generator Sizing and Installation for Florida Homes: What to Buy Before the Next Outage

Generator sizing and installation for Florida homes: portable vs standby, wattage needs, standby install costs, fuel choices, permits, and timing.

Generator Sizing and Installation for Florida Homes: What to Buy Before the Next Outage

A single hurricane can knock out power to millions of Florida homes at once, and restoration in hard-hit neighborhoods can take a week or longer. That week arrives in August or September heat, with no air conditioning, a warming refrigerator, and a garage door that will not open. A generator turns that week into an inconvenience instead of a hotel bill.

The two big decisions are what type of generator to buy and how large it needs to be. Get the sizing right and everything else follows: the fuel plan, the transfer equipment, and the installed price. This guide covers both decisions, plus permits, maintenance, and why the buying calendar matters as much as the budget.

Portable or Standby: Two Answers to the Same Storm

A portable generator costs $500 to $1,500 for a unit in the 5,000 to 8,500 watt range, and it runs on gasoline you pour in yourself. It powers a handful of circuits or extension cords, has to be wheeled out and started by hand, and needs fresh fuel every several hours. For many households, that trade is fine for something used a few days a year.

A standby generator is a permanent appliance mounted on a pad beside the house. It monitors utility power, starts itself within seconds of an outage, and runs on propane or natural gas, so nobody is hauling gas cans during a fuel shortage. Whole-house comfort through a week-long outage is what the extra money buys.

Portable units carry one safety rule worth repeating every season. Run them outdoors only, at least 20 feet from the house with the exhaust pointed away, because carbon monoxide from generators kills Floridians after nearly every major storm. Never run one in a garage, even with the door open.

Sizing Comes Down to What You Want to Run

Start with a list, not a wattage. Walk the house and decide what has to stay on during an outage: the refrigerator, some lights and fans, the internet router, phone chargers, maybe a window AC unit or a well pump. Each item has a running wattage, and motors also draw a larger startup surge the generator has to absorb.

Central air conditioning is the load that separates small generators from large ones. A typical 3-ton system needs several thousand watts running and considerably more at startup, so the AC alone often decides the size of the unit. Everything else in the house combined can add up to less than that one compressor.

Powering the Basics

A basics-only setup covering the refrigerator, lights, fans, electronics, and one small cooling unit generally lands in the 5,000 to 7,500 watt range. That is portable generator territory, and it keeps food safe and phones charged through a multi-day outage. It will not run central air, so plan on fans and shaded rooms.

Running Central Air and the Whole House

Covering a central AC system pushes you to roughly 14,000 watts and up, and true whole-home coverage for an average Florida house usually means an 18,000 to 26,000 watt standby unit. Larger homes with two AC systems, a pool pump, and an electric water heater can need more. An electrician's load calculation, not a guess, is what should set the final number.

Load management can split the difference. Smart modules shed the water heater or a second AC while the main system runs, letting a smaller, cheaper generator behave like a bigger one.

What a Standby Generator Costs Installed

Standby generators for an average Florida home usually land somewhere between $9,000 and $18,000 installed, covering the unit, the pad, the transfer switch, gas piping, and electrical work. The machine itself is often only about half of that number. Site conditions drive the rest: distance from the panel, gas meter upgrades, and county permit fees.

Smaller standby units in the 10,000 to 14,000 watt class can come in lower, sometimes $7,000 to $10,000 installed. At the other end, large homes with 26,000 watt units and long gas runs can pass $20,000. Written quotes from two or three installers are worth the effort at these prices.

Bundling the electrical and gas work into one quoted package avoids two contractors pointing at each other later. Some dealers also run off-season promotions that shave real money off the same equipment.

Transfer Switches and Fuel: The Parts People Forget

Any generator that connects to house wiring needs a transfer switch or interlock, because the connection must isolate your home from the utility grid. Backfeeding through a dryer outlet is illegal and can electrocute a line worker down the street. For portables, an inlet with a manual interlock typically runs $400 to $900 installed, while a full manual transfer switch is more like $800 to $2,000.

Standby units include an automatic transfer switch as part of the installation, which is what makes the ten-second self-start possible. The switch also keeps the generator from trying to power the whole neighborhood when the grid goes down.

Fuel choice shapes how a standby unit performs in a real hurricane. Natural gas is the easy answer where the utility serves your street: no tank, no deliveries, and the supply usually stays on through storms. Propane covers everyone else, with a 250 to 500 gallon tank commonly running a home generator for several days to a week of heavy use.

Gasoline is the weak link for portables. Stations lose power too, lines form before landfall, and stored gas degrades within months unless it is treated with stabilizer. Owning a portable without a fuel storage plan means owning a very heavy paperweight.

Permits, Licensed Installers, and Upkeep

Florida counties require permits for standby generator installations, and the work spans two licensed trades: an electrical contractor for the transfer switch and panel work, and a gas contractor for the fuel line. Many generator dealers hold or subcontract both licenses and pull the permits for you. Verify any contractor's license on the state DBPR website before signing.

Even a portable setup touches the permit system once you add an inlet or transfer switch, since that is panel work. A licensed electrician handles it in a few hours, and many homeowners pair that visit with a whole-home surge protector, a topic we covered in detail in a recent guide on this site.

Maintenance is modest but real. Standby units self-test weekly, need an oil and filter service about once a year or after extended running, and should get a professional checkup before each hurricane season. Batteries fail quietly, so that annual service is what catches the generator that would not have started.

Buy in the Off Season, Not in the Cone

Generator demand in Florida follows the forecast. The week a storm enters the Gulf, portables vanish from store shelves, installers book out for months, and prices stop being negotiable. Standby projects take four to eight weeks in a normal season anyway, counting permits, so even a June order may not save you in September.

Winter and spring are the buyer's window. Dealers discount, permit offices move faster, and you have time to compare bids instead of grabbing whatever is left in stock. Lining up quotes from licensed electricians across Florida is the natural first step, and our blog has more storm-prep guides worth reading before June.

Frequently Asked Questions

What size generator do I need to run my AC in Florida?

Central air is usually the deciding load, and covering a typical 3-ton system generally means a standby generator of roughly 14,000 watts or more once startup surge is counted. An electrician's load calculation gives the exact number, and load-shedding modules can let a smaller unit qualify.

How much does a whole-home generator cost installed in Florida?

Plan on $9,000 to $18,000 for most homes. The machine is often only about half the bill, with gas piping, the pad, the transfer switch, and permits making up the rest, and long gas runs can push totals past $20,000.

Do I need a permit to install a generator in Florida?

Yes for any standby unit, and yes for the transfer switch or inlet that connects a portable to house wiring. Licensed electrical and gas contractors pull these permits routinely, and the passed inspection matters for both insurance and resale.

Is propane or natural gas better for a standby generator?

Natural gas wins on convenience where the utility serves your street, since there is no tank to refill. Propane wins on availability everywhere else, and a 500 gallon tank commonly runs a home generator for close to a week of heavy use.