Florida whole-house generators rely on natural gas, LPG

Ray Brown Air and Heat says Florida homeowners shopping for a whole-house standby generator are usually choosing between two fuels: natural gas and liquid propane. That matches guidance from generator maker Generac, which says residential standby units most commonly run on pipeline natural gas or liquid propane, with many home models configured for one or the other. Florida local governments also treat fuel choice as part of the permitting process, requiring applicants to identify whether a generator will run on natural gas, propane or another fuel. The fuel question matters because it shapes the installation as much as the generator itself. A natural-gas setup depends on an existing gas utility connection and meter capacity. A propane setup usually means adding a dedicated storage tank on the property, along with separate fuel-line work, permits and inspections. ### If Florida standby generators usually are not diesel, what do they run on? Ray Brown Air and Heat says whole-house standby generators in Florida typically run on natural gas, or on liquid propane when natural gas is not available. The company’s 2026 buying guide for Titusville-area homeowners describes propane as the common fallback for homes without municipal gas service. Generac says the same two fuels dominate the residential market. The company’s support guidance says liquid propane and natural gas are the most common fuel types found in residential generators, while diesel models are mainly used in commercial applications, though some can be used at homes if codes allow. ### Why does propane change the installation so much? Generac says propane requires a minimum tank capacity of 250 gallons for home standby use and that small grill-style cylinders should not be used. Ray Brown Air and Heat says Florida propane installations can require burying a large tank, which adds site work beyond the generator pad and electrical connection. Ray Brown says that buried propane tank can give the house a dedicated fuel source that does not depend on municipal infrastructure during a major hurricane. Generac, by contrast, describes natural gas as drawing from an existing utility supply and says installers must verify that the gas meter can support the generator and other gas appliances in the home. ### What does a natural-gas setup require before installation? Generac says natural-gas installations require verification of gas-meter capacity, because the generator may be sharing fuel with stoves, furnaces, dryers or other appliances. The company also says fuel pressure, regulators and pipe sizing differ between natural gas and propane, making fuel selection an engineering and permitting issue rather than a simple preference. Florida permitting documents reflect that. Leon County’s standby-generator checklist requires applicants to provide the generator model number, kilowatt rating and fuel source, while Hillsborough County’s residential backup-generator requirements call for evidence of a fuel-gas permit or a notation that gas work will be handled separately. ### What else do Florida homeowners have to permit besides the fuel? Hillsborough County says residential backup-generator applications need a site plan, and Leon County’s checklist says permit packages must include load calculations, an electrical riser diagram and transfer-switch information. Both county documents treat permanently installed standby generators as code-governed construction projects rather than plug-in appliances. Generac says home standby generators are permanent installations that sit outside like a central air-conditioning unit and automatically start within seconds of an outage. The company says they shut off after utility power returns and are intended as backup power, not as a replacement for utility service. ### Where can a homeowner check the next step? Ray Brown Air and Heat’s 2026 buying guides and installation posts are one place homeowners can compare fuel options and project scope in Brevard County. Hillsborough County and Leon County publish residential generator permit checklists online, and Generac’s homeowner FAQ and fuel-type guidance outline the meter, tank and installation requirements dealers will ask about before quoting a system.