Outdoor & Garage · South
Cost to run a garage heater in Florida
At Florida’s average residential rate of 15.17¢ per kWh, a garage heater drawing 5000W for 3 hours a day costs about $41.56 a month. Change the numbers below to match how you actually use yours.
Heating season in Florida is short. A garage heater is likely to be a supplementary or occasional-use appliance here rather than a primary heat source, so the realistic annual cost is well below the figure implied by year-round daily use.
Quick answer
Based on 5000W at a 60% duty cycle (this equipment cycles on and off rather than drawing full power continuously) and 15.17¢/kWh, the Florida average for May 2026.
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— per year
Why the cost differs in Florida
Florida has the 19th cheapest residential electricity of the 51 US states and territories we track, at 15.17¢ per kWh against a national average of 18.44¢. That is -17.7% compared with the national figure. Florida runs a cooling load essentially year-round, and its generation mix is heavily natural gas, which makes bills unusually sensitive to fuel price swings. Retail service is regulated. Humidity is the hidden cost driver: air conditioners here spend a large share of their runtime removing moisture rather than lowering temperature, so duty cycles stay high even overnight during summer.
For this appliance specifically, the difference works out to a saving of $107 a year against what the same garage heater would cost at the national average rate. Run the identical appliance in Hawaii and it would cost $1,708 a year; in Idaho it would cost $406. That spread of $1,303 is entirely down to location.
At Florida's rate this single garage heater accounts for roughly 31% of a typical household's entire annual electricity bill. It is not a rounding error on your statement - it is one of the largest single line items in it.
Florida sits below the national average, so this garage heater costs slightly less to run here than it would for a typical US household. How you use it will move the number far more than where you live.
Retail service in Florida is regulated, so most households pay a tariff set through state rate cases rather than a shopped rate. The state average is a reasonable proxy, though your utility's specific tariff still varies.
| Location | Rate | Per month | Per year |
|---|---|---|---|
| Florida this page | 15.17¢ | $41.56 | $498 |
| US average | 18.44¢ | $50.52 | $606 |
| Idaho cheapest state | 12.35¢ | $33.83 | $406 |
| Hawaii most expensive | 52.00¢ | $142 | $1,708 |
Florida electricity rate trend
Rates in Florida have moved from 15.35¢ to 15.17¢ per kWh over the last twelve months of published data. Nationally, residential rates rose about 6.2% year over year.
2025-06 to 2026-05 · cents per kWh
About running a garage heater
Heating an uninsulated garage is expensive because most of the heat escapes. Insulating the door typically pays back faster than any efficiency upgrade to the heater.
What actually changes the cost
- Nameplate wattage is not running cost. This garage heater draws about 5000W when active, but cycles roughly 60% of the time it is switched on, so effective consumption is near 3000W.
- At typical use this is a major load - around 3,285 kWh a year. Efficiency upgrades here pay back faster than on any small appliance.
- Models vary widely, from about 3000W to 7500W. Check the nameplate on your own unit rather than assuming an average, because the spread is more than 2x.
- If your utility offers time-of-use pricing, shifting this load off-peak can cut its cost substantially without using any less energy.
How we worked this out
The arithmetic is simple and we would rather show it than hide it. Divide watts by 1,000 to get kilowatts, multiply by hours of use and by the duty cycle to get kilowatt-hours, then multiply by your rate:
5000W ÷ 1000 × 3h × 60% = 9.000 kWh/day × 15.17¢ = $1.365 per day
One honest caveat: Florida’s figure is a state average published by the EIA. Your own utility’s tariff, any time-of-use pricing, fixed monthly service charges and local taxes all shift the real number. Put your actual per-kWh rate into the calculator above for a figure that reflects your bill.
Questions about garage heater running costs
How many watts does a garage heater use?
A typical garage heater draws about 5000 watts while running, with most models falling between 3000W and 7500W. Check the nameplate label or manual for your specific unit - the range is wide enough that averages can mislead.
How much electricity does a garage heater use per day?
At around 3 hours of use a day and a 60% duty cycle, that works out to roughly 9 kWh per day, or about 270 kWh a month. Your actual figure depends on your usage and model.
Why does the cost differ so much between states?
Residential electricity rates across the US range from about 12.35 cents per kWh in North Dakota to 46.62 cents in Hawaii - nearly a fourfold difference. The same garage heater, used identically, therefore costs almost four times as much to run in the most expensive state as in the cheapest.
Is it cheaper to run a garage heater at night?
Only if you are on a time-of-use or variable tariff. On a flat rate, the time of day makes no difference to cost. If you are on time-of-use pricing, off-peak hours are typically materially cheaper, and shifting this load can reduce its cost without reducing usage.