Heating a Home in Florida: What the Winter Actually Costs

Florida doesn’t really have a heating season in the way Minnesota or Vermont does. But every house here still needs to answer the same question on the handful of cold nights each winter: what’s keeping the chill out, and what does it cost to run? The numbers below start with how cold it actually gets, then work through what a cord of firewood buys you if a wood stove or fireplace is part of the plan.

How cold it gets, and for how long

The coldest month in Jacksonville, the reference station for northern Florida, has an average daily minimum of 42.9°F. That’s not a record low. It’s the typical overnight floor during the coldest stretch of the year, according to NOAA’s 1991-2020 Climate Normals. For context, that’s roughly ten to fifteen degrees warmer than the coldest-month minimums you’d see in the Carolina Piedmont, and thirty-plus degrees above what a Midwest winter delivers.

What that number means in practice: heating in Florida isn’t about surviving months of sustained cold. It’s about managing short cold snaps, usually a handful of nights in December and January, sometimes stretching into a cool February. That raises the natural question of When Does the Heating Season Start in Florida?, since it looks nothing like the fixed, months-long season colder states plan around, and it’s the flip side of When Can You Turn the Heat Off in Florida? A furnace or heat pump sized for a Florida house runs a fraction of the hours its counterpart works in a colder state. Many homes lean on electric resistance heat or a heat pump’s backup coil for those nights, precisely because the load is light and short-lived rather than constant.

This also changes the math on supplemental heat sources like wood stoves and fireplaces. In a place where winter means four or five months near freezing, a wood stove is often the primary heat source, burning daily from November through March. In Florida, that same stove is more likely to be occasional, lit on the nights temperatures actually dip into the 30s or 40s. The heating season is real, but it’s short and mild by national standards, and that shapes how much fuel a household actually burns through the winter.

What a cord of wood is worth here

A cord is a volume, not a weight. That distinction is where a lot of firewood buyers get shortchanged. A full cord measures 4 feet by 4 feet by 8 feet, which works out to 128 cubic feet of stacked wood, air gaps included. Anything sold as a “cord” that doesn’t match that stack size isn’t a full cord, whatever the price tag says.

According to Michigan State University Extension, a cord of well-seasoned hardwood delivers about 20 million BTU of heat energy. MSU frames that in terms a homeowner can actually use: one cord is roughly equivalent to 145 gallons of #2 fuel oil, or 215 gallons of LP gas. That’s the yardstick worth remembering when you’re deciding how much wood to lay in for a Florida winter, where a stove might only run on thirty or forty nights rather than a hundred and fifty.

That BTU figure is an average, and it moves a lot depending on species and how dry the wood actually is. Dense hardwoods pack more mass into the same 128 cubic feet than a lighter wood does, so two cords that look identical stacked side by side can burn very differently once they’re in the stove. Given how mild and short a Florida heating season runs, a single cord bought and properly dried often carries a household through the whole winter without needing a second delivery.

How long wood takes to dry in Florida

Seasoning time isn’t a fixed number. It’s a function of humidity, heat, and airflow, and Florida’s climate cuts both ways on that. MSU Extension puts the target at 20 percent moisture or less before wood is ready to burn efficiently; green wood, fresh off the tree, can run over 60 percent moisture. That difference matters because every bit of that water has to boil off inside the firebox before the wood starts actually producing usable heat. Burn it too soon and you’re spending fuel energy on evaporation instead of warming the room.

Split and stacked wood with good air movement typically reaches that 20 percent mark after one full summer of drying, per MSU. Florida’s long, hot summer actually works in a burner’s favor here, since heat speeds up moisture loss. But the state’s humidity cuts the other way, slowing evaporation compared to a drier climate. The wood needs to be split and stacked off the ground, not left in rounds and not tarped tight, or the trapped moisture never really leaves.

Red oak is the one species MSU flags by name as an exception. Its cell structure holds onto moisture longer than most hardwoods, so it needs more than a single summer to season properly, even under good stacking conditions.

Burning wood before it’s ready shows up in three ways: less heat per log, more smoke, and a heavier buildup of creosote in the flue. That last one isn’t cosmetic. Creosote buildup means more frequent chimney sweeps, and in the worst cases it raises the risk of a chimney fire. None of that requires alarm, just patience and a wood pile stacked a season ahead of when you plan to burn it.

Where to check before you buy

Every figure above describes conditions around Jacksonville, the NOAA reference station for this data. Florida stretches from the Panhandle to the Keys, and a house in Tallahassee sees noticeably colder nights than one in Miami. Elevation barely factors into it here, but latitude and coastal exposure do, and both shift the actual cold snaps a given house will face.

Before buying a stove, insert, or a season’s worth of firewood, check with the University of Florida IFAS Extension. Local extension offices can speak to which hardwood species are actually available and well-seasoned in your part of the state, and they track outdoor burning rules that vary by county and change from year to year. Burn restrictions aren’t set at the state level in any uniform way; they’re a local call, often tied to drought conditions or air quality, so what was fine last winter may not be this winter.

What each heat source costs to run in Florida

At Florida’s average residential prices, this is what one million Btu of heat delivered into the house costs with each system. It compares fuels on the same unit: it is not a yearly bill, and it leaves out the price of the equipment.

Cheapest to run in Florida: heat pump, $6.97 less per million Btu than the natural gas furnace.

Prices: U.S. Energy Information Administration (EIA), average residential prices. Efficiencies: ENERGY STAR criteria. A heat pump’s figure is a seasonal average; in the coldest weather its efficiency drops.

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