What Size Whole-Home Generator Do I Need in Florida?

There is no single generator size for a Florida house, but here is the honest range: most of the standby generators we install are air-cooled Generac units somewhere between roughly 10 and 26 kilowatts. Where you land inside that range depends on two things, how much of the house you want to back up and what your air conditioning needs to start. A proper load calculation settles it, and that is part of every whole-home generator installation quote we put together. Here is how to think it through before anyone shows up with a clipboard.

Start with what you want to keep running

Sizing begins with a list, not a spec sheet. Decide which of these you actually need during an outage:

• The essentials: refrigerator, lights, internet, garage door, and one cool room
• The essentials plus the big loads: central AC, water heater, washer and dryer
• Everything, so the house runs like the power never went out

A managed-load setup protects the essentials and automatically sheds big appliances when the generator gets close to its limit. Whole-home coverage usually means a larger unit and more transfer equipment, so it costs more up front. Neither answer is wrong. A retired couple in a Delray Beach bungalow has a different list than a family on a Jupiter Farms lot with a well pump, and their generators should be different sizes too.

Your air conditioner decides most of it

Florida outages come with heat. When a line goes down in August in Palm Bay or Boynton Beach, the question is never whether the fridge stays cold. It is whether the AC comes back on. Air conditioning is the largest electrical load in almost every Florida home, and the moment the compressor starts, it briefly pulls far more power than it does while running. That starting surge, not the running load, is what knocks undersized generators offline.

This is why two houses with the same square footage can need different units. A two-story Boca Raton home with two condensers is a heavier lift than a single-story block home in Cocoa with one modest system. It is also why we sometimes add a soft starter to the AC: it trims the starting surge so a mid-size generator can handle a compressor that would otherwise call for a bigger machine.

What a real load calculation looks like

If a contractor quotes you a generator size over the phone without seeing the house, be careful. A proper sizing visit is not complicated, but it is physical:

• We open the panel and note its condition, its capacity, and how your circuits are laid out
• Nameplates come next: AC condensers, water heater, range, dryer, pool equipment, and the well pump if you have one
• The fuel supply gets the same attention, because gas limits a generator as much as wiring does. On natural gas, the meter and line size have to support the unit at full output. Where street gas is not available, which is common in parts of Brevard, we size a propane tank instead.
• Placement rounds it out: setbacks from windows and property lines, a stable pad, and anchoring that meets Florida wind requirements

Permitting is part of the job, whether that is Palm Beach County, the Town of Jupiter, or Brevard County, and the inspection that follows checks the same things the calculation planned for.

Bigger is not automatically better

It is tempting to settle the question with the biggest unit on the truck. We talk people out of that regularly. An oversized generator costs more to buy, burns more fuel, and spends its life loafing, which is not good for the engine. An undersized one nuisance-trips on the first hot afternoon. The right answer is usually the smallest unit that starts your AC and carries your list, with load management covering the rest.

Price follows the site, not just the size. The gas line run, the distance from the pad to your panel and meter, the condition of the panel itself, and the permit all move the number more than most people expect. If you see a flat figure online, treat it as a typical industry range that shifts with every one of those variables, not a quote.

If you want a real number instead of a range, we will come out, run the load calculation, and put a free, no-obligation quote in writing, with the generator, gas work, permit, and installation spelled out. It is the same approach we bring to every residential electrical project we take on. Call (844) 432-2262 and we will get back to you within one business day.

Frequently Asked Questions

Can I size a generator from an online wattage chart?

Charts are a starting point, but they miss starting surge and your fuel supply. The AC condenser nameplate and the gas meter capacity change the answer more than any chart.

Will a whole-home generator run my air conditioning?

Yes, if it is sized for it. Central AC is the largest starting load in almost every Florida home, which is exactly why we run a load calculation before quoting a unit.

Does a two-story house need a bigger generator?

Square footage matters less than equipment. A two-story home with two AC condensers usually needs more capacity than a larger single-story home with one.