Pool swim season in Killeen, TX
Swim season in Killeen without a heater, and with one
An unheated pool in Killeen reaches 78°F in Jun to Sep, about 4 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 Killeen pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 4 | Jun to Sep | $0 | $0 |
| Solar cover only | 6 | May to Oct | $0 | $50 |
| Solar panels + cover | 7 | Apr to Oct | $0 | $283 |
| Heat pump + cover | 7 | Apr to Oct | $104 | $654 |
| Gas heater + cover | 7 | Apr to Oct | $257 | $682 |
For a 450 sq ft pool held at 80°F, at TX prices of 16.0¢/kWh electricity and $19/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Killeen
Solar cover only: 6 of 7 possible months for about $50 a year all-in, which works out near $25 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: Killeen, 2.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Killeen 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 | 60° | 48° | 3.0 | 49° | 55° | – | – |
| Feb | 63° | 52° | 3.5 | 50° | 56° | – | – |
| Mar | 70° | 59° | 4.5 | 57° | 63° | – | – |
| Apr | 77° | 65° | 5.5 | 64° | 70° | $89 | $217 |
| May | 84° | 73° | 5.9 | 72° | 78° | $15 | $40 |
| Jun | 92° | 81° | 6.8 | 81° | 87° | – | – |
| Jul | 96° | 84° | 6.8 | 86° | 92° | – | – |
| Aug | 97° | 85° | 6.3 | 88° | 94° | – | – |
| Sep | 90° | 78° | 5.2 | 84° | 90° | – | – |
| Oct | 80° | 68° | 4.2 | 74° | 80° | – | – |
| Nov | 69° | 58° | 3.2 | 63° | 69° | – | – |
| Dec | 60° | 49° | 2.7 | 53° | 59° | – | – |
Heating costs most in Apr (about $89 with a heat pump, $217 with gas). Sunshine peaks in Jul at 6.8 kWh/m²/day (NASA satellite data, 51.9 km grid cell). Highlighted months are swimmable with no heater.
How Killeen compares with nearby cities
Killeen ranks 148 of 252 Texas cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Harker Heights, TX | 5 mi | 4 | 7 | $104 |
| Copperas Cove, TX | 11 mi | 4 | 7 | $104 |
| Belton, TX | 15 mi | 4 | 8 | $275 |
| Temple, TX | 20 mi | 4 | 8 | $275 |
| Gatesville, TX | 25 mi | 4 | 8 | $265 |
| Georgetown, TX | 28 mi | 4 | 8 | $252 |