Pool swim season in Marco Island, FL
Swim season in Marco Island without a heater, and with one
An unheated pool in Marco Island 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 Marco Island 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 | 12 | all year | $0 | $283 |
| Heat pump + cover | 12 | all year | $180 | $730 |
| Gas heater + cover | 12 | all year | $610 | $1,035 |
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 Marco Island
Solar panels + cover: 12 of 12 possible months for about $283 a year all-in, which works out near $47 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: Marco Is, 1.3 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Marco Island 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 | 74° | 64° | 3.8 | 67° | 73° | $64 | $211 |
| Feb | 76° | 67° | 4.7 | 67° | 73° | $59 | $200 |
| Mar | 79° | 69° | 5.8 | 71° | 77° | $27 | $94 |
| Apr | 83° | 74° | 6.5 | 75° | 81° | – | – |
| May | 88° | 79° | 6.6 | 80° | 86° | – | – |
| Jun | 90° | 82° | 6.0 | 83° | 89° | – | – |
| Jul | 91° | 84° | 6.0 | 86° | 92° | – | – |
| Aug | 92° | 84° | 5.6 | 86° | 92° | – | – |
| Sep | 90° | 83° | 5.1 | 85° | 91° | – | – |
| Oct | 87° | 79° | 4.7 | 82° | 88° | – | – |
| Nov | 81° | 72° | 4.1 | 77° | 83° | – | – |
| Dec | 77° | 68° | 3.6 | 70° | 76° | $30 | $105 |
Heating costs most in Jan (about $64 with a heat pump, $211 with gas). Sunshine peaks in May at 6.6 kWh/m²/day (NASA satellite data, 52.2 km grid cell). Highlighted months are swimmable with no heater.
How Marco Island compares with nearby cities
Marco Island ranks 44 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 |
|---|---|---|---|---|
| Naples, FL | 16 mi | 6 | 12 | $160 |
| Bonita Springs, FL | 30 mi | 6 | 12 | $188 |
| Estero, FL | 35 mi | 6 | 12 | $188 |
| Fort Myers, FL | 48 mi | 6 | 12 | $179 |
| Cape Coral, FL | 52 mi | 6 | 12 | $179 |
| Punta Gorda, FL | 70 mi | 6 | 12 | $179 |