Pool swim season in Collegedale, TN
Swim season in Collegedale without a heater, and with one
An unheated pool in Collegedale reaches 78°F in Jul to Sep, about 3 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 Collegedale pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 3 | Jul to Sep | $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 | $200 | $750 |
| Gas heater + cover | 7 | Apr to Oct | $337 | $762 |
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 Collegedale
Solar panels + cover: 6 of 7 possible months for about $283 a year all-in, which works out near $94 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 1 month 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: Chattanooga Airport, 8.7 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Collegedale 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 | 51° | 42° | 2.3 | 42° | 48° | – | – |
| Feb | 56° | 46° | 2.9 | 44° | 50° | – | – |
| Mar | 64° | 53° | 4.0 | 50° | 56° | – | – |
| Apr | 74° | 62° | 5.3 | 60° | 66° | $119 | $196 |
| May | 81° | 70° | 5.8 | 69° | 75° | $40 | $73 |
| Jun | 88° | 77° | 6.3 | 77° | 83° | – | – |
| Jul | 91° | 81° | 6.0 | 82° | 88° | – | – |
| Aug | 90° | 80° | 5.5 | 83° | 89° | – | – |
| Sep | 84° | 74° | 4.8 | 79° | 85° | – | – |
| Oct | 74° | 63° | 3.7 | 69° | 75° | $41 | $68 |
| Nov | 62° | 51° | 2.8 | 57° | 63° | – | – |
| Dec | 53° | 44° | 2.0 | 47° | 53° | – | – |
Heating costs most in Apr (about $119 with a heat pump, $196 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 64.4 km grid cell). Highlighted months are swimmable with no heater.
How Collegedale compares with nearby cities
Collegedale ranks 11 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 |
|---|---|---|---|---|
| East Ridge, TN | 11 mi | 3 | 7 | $195 |
| Chattanooga, TN | 11 mi | 3 | 7 | $200 |
| Cleveland, TN | 13 mi | 2 | 7 | $262 |
| Fort Oglethorpe, GA | 14 mi | 2 | 7 | $299 |
| Red Bank, TN | 15 mi | 0 | 5 | $90 |
| Soddy-Daisy, TN | 16 mi | 1 | 7 | $314 |