Pool swim season in Longwood, FL
When can you swim in an outdoor pool in Longwood, FL?
An unheated pool in Longwood reaches 78°F in May to Oct, about 6 months a year. The air allows up to 12 swimmable months with a heater (all year).
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Heater options for a Longwood pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 6 | May to Oct | $0 | $0 |
| Solar cover only | 8 | Apr to Nov | $0 | $50 |
| Solar panels + cover | 9 | Mar to Nov | $0 | $283 |
| Heat pump + cover | 12 | all year | $366 | $916 |
| Gas heater + cover | 12 | all year | $1,197 | $1,622 |
For a 450 sq ft pool held at 80°F, at FL prices of 15.3¢/kWh electricity and $25/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Longwood
Heat pump + cover: 12 of 12 possible months for about $916 a year all-in, which works out near $153 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 2 months here for about $50 a year (why a cover comes first). If you get quotes, ask for a heat pump sized to your pool's surface area; here it beats gas all-in (heat pump or gas).
Weather station: Orlando Sanford Airport, 8.3 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Longwood month by month: air, sun and pool water
| Month | Air high | Air avg | Sun kWh/m²/day | Water, unheated | Water, covered | Heat pump $ | Gas $ |
|---|---|---|---|---|---|---|---|
| Jan | 71° | 60° | 3.5 | 62° | 68° | $111 | $348 |
| Feb | 74° | 63° | 4.1 | 63° | 69° | $101 | $330 |
| Mar | 78° | 67° | 5.2 | 67° | 73° | $57 | $197 |
| Apr | 83° | 72° | 6.1 | 73° | 79° | $9 | $35 |
| May | 89° | 78° | 6.5 | 79° | 85° | – | – |
| Jun | 91° | 82° | 5.8 | 83° | 89° | – | – |
| Jul | 93° | 84° | 5.7 | 86° | 92° | – | – |
| Aug | 93° | 84° | 5.4 | 86° | 92° | – | – |
| Sep | 90° | 81° | 4.9 | 84° | 90° | – | – |
| Oct | 85° | 76° | 4.4 | 80° | 86° | – | – |
| Nov | 78° | 68° | 3.6 | 73° | 79° | $13 | $44 |
| Dec | 73° | 63° | 3.1 | 66° | 72° | $75 | $243 |
Heating costs most in Jan (about $111 with a heat pump, $348 with gas). Sunshine peaks in May at 6.5 kWh/m²/day (NASA satellite data, 26.8 km grid cell). Highlighted months are swimmable with no heater.
How Longwood compares with nearby cities
Longwood ranks 55 of 173 Florida cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Casselberry, FL | 3 mi | 6 | 12 | $312 |
| Altamonte Springs, FL | 4 mi | 6 | 12 | $312 |
| Lake Mary, FL | 4 mi | 5 | 12 | $402 |
| Winter Springs, FL | 5 mi | 6 | 12 | $366 |
| Maitland, FL | 5 mi | 6 | 12 | $312 |
| Winter Park, FL | 7 mi | 6 | 12 | $312 |