How to Choose the Right Generator Size for Your Home

Generator sizing isn't a guess — it's a load calculation based on what you actually want to keep running during an outage. The two big buckets:

Essential-Circuits Coverage

A smaller, less expensive generator that powers a defined set of circuits — refrigerator, well pump, some lighting and outlets, maybe one AC zone. Enough to keep a household functioning safely and comfortably without running everything in the house at once.

Whole-Home Coverage

A larger generator sized to run the entire house, including full central air conditioning — the single biggest factor in Florida sizing decisions, since AC draws far more than almost anything else in the home. Whole-home coverage means life goes on close to normal during an extended outage, at a higher equipment and installation cost.

What Actually Drives the Number

• Central AC tonnage — the single largest load in most Florida homes, and usually the deciding factor between a mid-size and a larger generator.
• Square footage and household size — more space and more people generally means more simultaneous load.
• Well pump, pool equipment, or a second AC zone — each adds meaningfully to the required capacity.
• How long you expect to run unattended — seasonal or vacant-home owners often size up specifically so the system doesn't need anyone present to manage load.

The reliable way to get this right is a licensed electrician doing an actual load calculation against your panel and equipment — not a size picked off a chart. See generator installation for what a proper estimate covers, including current pricing.