Pool swim season in Athens, TN
Swim season in Athens without a heater, and with one
An unheated pool in Athens 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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What each heater buys you in Athens
| 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 | $286 | $836 |
| Gas heater + cover | 7 | Apr to Oct | $466 | $891 |
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 Athens
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: Athens, 2.1 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Athens 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 | 49° | 38° | 2.4 | 39° | 45° | – | – |
| Feb | 53° | 42° | 2.9 | 40° | 46° | – | – |
| Mar | 62° | 50° | 4.0 | 47° | 53° | – | – |
| Apr | 71° | 58° | 5.3 | 56° | 62° | $155 | $244 |
| May | 79° | 67° | 5.9 | 66° | 72° | $66 | $117 |
| Jun | 85° | 74° | 6.3 | 74° | 80° | $1 | $2 |
| Jul | 88° | 78° | 6.0 | 79° | 85° | – | – |
| Aug | 88° | 77° | 5.5 | 80° | 86° | – | – |
| Sep | 83° | 72° | 4.8 | 76° | 82° | – | – |
| Oct | 73° | 60° | 3.8 | 67° | 73° | $64 | $103 |
| Nov | 61° | 49° | 2.8 | 54° | 60° | – | – |
| Dec | 52° | 42° | 2.1 | 44° | 50° | – | – |
Heating costs most in Apr (about $155 with a heat pump, $244 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 10.6 km grid cell). Highlighted months are swimmable with no heater.
How Athens compares with nearby cities
Athens ranks 41 of 65 Tennessee cities for unheated swim months; Collegedale nearby gets a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Cleveland, TN | 24 mi | 2 | 7 | $262 |
| Lenoir City, TN | 31 mi | 2 | 7 | $278 |
| Soddy-Daisy, TN | 35 mi | 1 | 7 | $314 |
| Collegedale, TN | 37 mi | 3 | 7 | $200 |
| Farragut, TN | 38 mi | 2 | 7 | $278 |
| Oak Ridge, TN | 39 mi | 2 | 7 | $288 |