Pool swim season in Casselberry, FL
Swim season in Casselberry without a heater, and with one
An unheated pool in Casselberry 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 Casselberry 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 | $312 | $862 |
| Gas heater + cover | 12 | all year | $1,026 | $1,451 |
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 Casselberry
Heat pump + cover: 12 of 12 possible months for about $862 a year all-in, which works out near $144 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 Executive Airport, 8 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Casselberry 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° | 62° | 3.5 | 63° | 69° | $101 | $322 |
| Feb | 74° | 64° | 4.1 | 64° | 70° | $90 | $296 |
| Mar | 78° | 68° | 5.2 | 69° | 75° | $46 | $162 |
| Apr | 83° | 73° | 6.1 | 74° | 80° | $2 | $6 |
| May | 88° | 78° | 6.5 | 79° | 85° | – | – |
| Jun | 91° | 82° | 5.8 | 83° | 89° | – | – |
| Jul | 92° | 84° | 5.7 | 86° | 92° | – | – |
| Aug | 92° | 84° | 5.4 | 86° | 92° | – | – |
| Sep | 90° | 82° | 4.9 | 85° | 91° | – | – |
| Oct | 84° | 76° | 4.4 | 81° | 87° | – | – |
| Nov | 78° | 69° | 3.6 | 73° | 79° | $6 | $19 |
| Dec | 73° | 64° | 3.1 | 67° | 73° | $67 | $221 |
Heating costs most in Jan (about $101 with a heat pump, $322 with gas). Sunshine peaks in May at 6.5 kWh/m²/day (NASA satellite data, 25.0 km grid cell). Highlighted months are swimmable with no heater.
How Casselberry compares with nearby cities
Casselberry ranks 52 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 |
|---|---|---|---|---|
| Longwood, FL | 3 mi | 6 | 12 | $366 |
| Winter Springs, FL | 4 mi | 6 | 12 | $366 |
| Maitland, FL | 4 mi | 6 | 12 | $312 |
| Altamonte Springs, FL | 4 mi | 6 | 12 | $312 |
| Winter Park, FL | 5 mi | 6 | 12 | $312 |
| Lake Mary, FL | 7 mi | 5 | 12 | $402 |