Florida Pool Heating Season | FL Pool Heater Pros

General information, not legal, engineering or insurance advice.

Florida summers keep pools warm without help. Once the first cold fronts arrive, water temperatures drop and many owners start thinking about a heater. Here's what the cooler months look like, how to hold on to heat, and how to protect pool equipment on the rare nights that get close to freezing.

When Florida pools start to cool

Florida doesn't have four classic seasons so much as a warm, wet season and a cooler, drier one. A National Weather Service study of east central Florida found:¹

The dry (cooler) season usually begins in October, when the first cold front brings drier and slightly cooler air.
The median start of the dry season was October 15 at both Orlando and Daytona Beach.
The median date of the first temperature below 60°F was October 19 at Orlando and October 16 at Daytona Beach.
Fronts continue to push through during December, January and February.
Late February through March brings large swings in temperature, and temperatures warm through May.

The same study notes that the wet season in southern Florida may start earlier and end later because of the nearby Gulf Stream, citing an average South Florida rainy season of May 21 to October 17.¹ North Florida generally runs cooler than the south, so the heating season tends to be longer the farther north you are. In practice, the pool heating season for most of the state is roughly October through March, with the timing varying from year to year.

Cold fronts and cold snaps

A cold front can bring a sharp drop in air temperature. University of Florida researchers note that fronts "bring a change in air temperature and last only a few days," and that several can arrive back to back.² For a pool, that means:

Water loses heat fastest on the cool, dry, windy nights right after a front passes.
A heat pump delivers less heat when the air is cold, so it may lag behind during a cold snap and catch up as the air warms.
Solar collects less on cloudy days and short winter days.
A gas heater can maintain any desired temperature regardless of the weather.³

Use a cover to keep the heat

Evaporation is by far the largest source of a pool's energy loss, and pool covers can save 50% to 70% of pool heating costs.⁴ Covering a pool when it isn't in use is the single most effective way to reduce heating costs, and covers can also cut chemical use, reduce make-up water and keep debris out.³

When choosing a cover, the Florida fact sheet suggests looking at durability, how easy it is to take on and off, price, warranty, material transparency, insulation value, storage needs and safety.³

Freeze precautions for pool equipment

Freezing nights are uncommon in much of Florida, but a strong cold snap can bring them, especially in north and central Florida. Water left standing in pipes and equipment can freeze and crack them. University of Florida guidance for cold snaps includes covering pipes and dripping outdoor faucets to keep them from freezing.² For pool equipment:

Check your freeze protection. If your pool automation has a freeze-protection setting that runs the pump when it gets cold, make sure it's turned on and working before the season.
Follow your equipment manuals. Heat pumps, gas heaters, pumps and filters each have their own cold-weather instructions. Your heater manual is the authority for your unit.
Solar systems need their own plan. Ask your installer how your solar collectors drain or are protected in a freeze.
Plan for power outages. Freeze protection that depends on running the pump won't work without power. Ask your pool professional what to do if the power goes out on a freezing night.
Call a licensed pro after a hard freeze if you see leaks, cracks or a heater that won't start, rather than running damaged equipment.

Watch your local National Weather Service forecast at weather.govfor freeze watches and warnings, and get equipment ready before a forecast freeze, not after.

Getting ready for heating season

Before the first cold front, run the heater and check that it reaches your set temperature.
Clean or service the filter so water flows freely through the heater.
Make sure the area around a heat pump is clear so it gets good airflow.
Have a licensed contractor inspect a gas heater, and check solar collectors and valves, if it's been a while.
Set the temperature sensibly. Lower set points save energy.
Put the cover on when the pool isn't in use.

Sources

Randy Lascody, National Weather Service Melbourne, “The Onset of the Wet and Dry Seasons in East Central Florida: A Subtropical Wet-Dry Climate?” (2002; tables updated through 2010).
University of Florida Thompson Earth Systems Institute, “Tell Me About: Cold Fronts” (January 10, 2025).
Florida Department of Community Affairs, Building A Safer Florida and University of Florida IFAS Extension, “Residential Swimming Pool Efficiency” fact sheet (May 2006).
U.S. Department of Energy, Better Buildings, “Pool Efficiency” fact sheet.