Pool swim season in Coolidge, AZ
Coolidge, AZ: how long the pool season really is
An unheated pool in Coolidge reaches 78°F in May to Oct, about 6 months a year. The air allows up to 10 swimmable months with a heater (Feb to Nov).
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What each heater buys you in Coolidge
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 6 | May to Oct | $0 | $0 |
| Solar cover only | 6 | May to Oct | $0 | $50 |
| Solar panels + cover | 8 | Apr to Nov | $0 | $283 |
| Heat pump + cover | 10 | Feb to Nov | $397 | $947 |
| Gas heater + cover | 10 | Feb to Nov | $891 | $1,316 |
For a 450 sq ft pool held at 80°F, at AZ prices of 15.4¢/kWh electricity and $19/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Coolidge
Heat pump + cover: 10 of 10 possible months for about $947 a year all-in, which works out near $237 for each month it adds.
A solar cover alone adds no swim months here, so if you want a longer season you need a heater (why); still use one at night to hold the heat you pay for. 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: Casa Grande Nm, 4.3 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Coolidge 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 | 68° | 52° | 3.6 | 53° | 59° | – | – |
| Feb | 71° | 56° | 4.6 | 56° | 62° | $188 | $399 |
| Mar | 78° | 62° | 6.0 | 62° | 68° | $115 | $267 |
| Apr | 86° | 69° | 7.4 | 70° | 76° | $38 | $96 |
| May | 95° | 77° | 8.2 | 78° | 84° | – | – |
| Jun | 105° | 87° | 8.4 | 87° | 93° | – | – |
| Jul | 107° | 92° | 7.2 | 93° | 99° | – | – |
| Aug | 105° | 91° | 6.7 | 95° | 101° | – | – |
| Sep | 101° | 85° | 6.1 | 91° | 97° | – | – |
| Oct | 91° | 73° | 5.1 | 81° | 87° | – | – |
| Nov | 78° | 61° | 3.9 | 68° | 74° | $56 | $129 |
| Dec | 67° | 52° | 3.2 | 56° | 62° | – | – |
Heating costs most in Feb (about $188 with a heat pump, $399 with gas). Sunshine peaks in Jun at 8.4 kWh/m²/day (NASA satellite data, 48.3 km grid cell). Highlighted months are swimmable with no heater.
How Coolidge compares with nearby cities
Coolidge ranks 17 of 44 Arizona cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Florence, AZ | 11 mi | 6 | 10 | $326 |
| Eloy, AZ | 14 mi | 6 | 11 | $625 |
| Casa Grande, AZ | 14 mi | 6 | 10 | $339 |
| Queen Creek, AZ | 22 mi | 6 | 9 | $206 |
| Maricopa, AZ | 29 mi | 6 | 10 | $384 |
| Gilbert, AZ | 29 mi | 6 | 9 | $206 |