Pool swim season in Nashville-Davidson, TN
Swim season in Nashville-Davidson without a heater, and with one
An unheated pool in Nashville-Davidson reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 7 swimmable months with a heater (Apr to Oct).
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Heater options for a Nashville-Davidson pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 2 | Jul to Aug | $0 | $0 |
| Solar cover only | 4 | Jun to Sep | $0 | $50 |
| Solar panels + cover | 6 | May to Oct | $0 | $283 |
| Heat pump + cover | 7 | Apr to Oct | $266 | $816 |
| Gas heater + cover | 7 | Apr to Oct | $438 | $863 |
For a 450 sq ft pool held at 80°F, at TN prices of 13.8¢/kWh electricity and $12/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Nashville-Davidson
Solar panels + cover: 6 of 7 possible months for about $283 a year all-in, which works out near $71 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: Shelby Bottoms Nature, 3.4 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Nashville-Davidson 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 | 48° | 38° | 2.2 | 39° | 45° | – | – |
| Feb | 52° | 42° | 2.8 | 40° | 46° | – | – |
| Mar | 62° | 50° | 3.9 | 47° | 53° | – | – |
| Apr | 72° | 60° | 5.2 | 57° | 63° | $144 | $231 |
| May | 80° | 68° | 5.7 | 67° | 73° | $58 | $103 |
| Jun | 87° | 75° | 6.3 | 75° | 81° | – | – |
| Jul | 89° | 79° | 6.1 | 80° | 86° | – | – |
| Aug | 89° | 78° | 5.6 | 81° | 87° | – | – |
| Sep | 84° | 72° | 4.7 | 76° | 82° | – | – |
| Oct | 73° | 60° | 3.6 | 66° | 72° | $64 | $104 |
| Nov | 62° | 49° | 2.6 | 54° | 60° | – | – |
| Dec | 51° | 41° | 1.9 | 44° | 50° | – | – |
Heating costs most in Apr (about $144 with a heat pump, $231 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 44.5 km grid cell). Highlighted months are swimmable with no heater.
How Nashville-Davidson compares with nearby cities
Nashville-Davidson ranks 25 of 65 Tennessee cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Goodlettsville, TN | 12 mi | 2 | 7 | $296 |
| Brentwood, TN | 12 mi | 2 | 7 | $320 |
| Hendersonville, TN | 14 mi | 2 | 7 | $296 |
| Mount Juliet, TN | 15 mi | 2 | 7 | $288 |
| Nolensville, TN | 16 mi | 2 | 7 | $320 |
| La Vergne, TN | 16 mi | 2 | 7 | $326 |