How to Choose the Right Generator Size for Your Home

Generator sizing is 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.