Pool swim season in Boerne, TX
Swim season in Boerne without a heater, and with one
An unheated pool in Boerne reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 9 swimmable months with a heater (Mar to Nov).
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What each heater buys you in Boerne
| 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 | 9 | Mar to Nov | $364 | $914 |
| Gas heater + cover | 9 | Mar to Nov | $837 | $1,262 |
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 Boerne
Heat pump + cover: 9 of 9 possible months for about $914 a year all-in, which works out near $183 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: Boerne, 1 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Boerne 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 | 62° | 49° | 3.1 | 50° | 56° | – | – |
| Feb | 66° | 53° | 3.6 | 52° | 58° | – | – |
| Mar | 72° | 60° | 4.5 | 58° | 64° | $161 | $364 |
| Apr | 79° | 66° | 5.4 | 65° | 71° | $79 | $195 |
| May | 84° | 73° | 5.9 | 73° | 79° | $11 | $30 |
| Jun | 90° | 79° | 6.7 | 80° | 86° | – | – |
| Jul | 93° | 82° | 6.7 | 84° | 90° | – | – |
| Aug | 94° | 82° | 6.4 | 86° | 92° | – | – |
| Sep | 89° | 77° | 5.2 | 82° | 88° | – | – |
| Oct | 81° | 68° | 4.4 | 74° | 80° | $2 | $4 |
| Nov | 70° | 58° | 3.3 | 63° | 69° | $111 | $244 |
| Dec | 63° | 50° | 2.8 | 54° | 60° | – | – |
Heating costs most in Mar (about $161 with a heat pump, $364 with gas). Sunshine peaks in Jul at 6.7 kWh/m²/day (NASA satellite data, 38.6 km grid cell). Highlighted months are swimmable with no heater.
How Boerne compares with nearby cities
Boerne ranks 233 of 252 Texas cities for unheated swim months; Helotes, Leon Valley nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Fair Oaks Ranch, TX | 6 mi | 4 | 9 | $364 |
| Helotes, TX | 15 mi | 5 | 9 | $191 |
| Leon Valley, TX | 21 mi | 5 | 9 | $191 |
| San Antonio, TX | 25 mi | 4 | 9 | $265 |
| Live Oak, TX | 28 mi | 4 | 9 | $256 |
| Selma, TX | 28 mi | 4 | 9 | $256 |