Pool swim season in Kearns, UT
Swim season in Kearns without a heater, and with one
An unheated pool in Kearns reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 5 swimmable months with a heater (May to Sep).
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What each heater buys you in Kearns
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 2 | Jul to Aug | $0 | $0 |
| Solar cover only | 3 | Jul to Sep | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 5 | May to Sep | $128 | $678 |
| Gas heater + cover | 5 | May to Sep | $191 | $616 |
For a 450 sq ft pool held at 80°F, at UT prices of 13.2¢/kWh electricity and $10/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Kearns
Solar panels + cover: 4 of 5 possible months for about $283 a year all-in, which works out near $142 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 gas as well as a heat pump: once the purchase price is counted, gas comes out cheaper all-in here (heat pump or gas).
Weather station: Salt Lake City International Airport, 8.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Kearns 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 | 39° | 31° | 2.1 | 31° | 37° | – | – |
| Feb | 45° | 37° | 3.1 | 34° | 40° | – | – |
| Mar | 55° | 46° | 4.4 | 43° | 49° | – | – |
| Apr | 62° | 52° | 5.7 | 52° | 58° | – | – |
| May | 73° | 62° | 6.8 | 60° | 66° | $109 | $160 |
| Jun | 84° | 72° | 7.8 | 71° | 77° | $19 | $31 |
| Jul | 94° | 81° | 7.4 | 81° | 87° | – | – |
| Aug | 92° | 79° | 6.6 | 84° | 90° | – | – |
| Sep | 81° | 68° | 5.4 | 76° | 82° | – | – |
| Oct | 66° | 55° | 3.9 | 62° | 68° | – | – |
| Nov | 51° | 42° | 2.5 | 48° | 54° | – | – |
| Dec | 39° | 32° | 1.8 | 36° | 42° | – | – |
Heating costs most in May (about $109 with a heat pump, $160 with gas). Sunshine peaks in Jun at 7.8 kWh/m²/day (NASA satellite data, 44.7 km grid cell). Highlighted months are swimmable with no heater.
How Kearns compares with nearby cities
Kearns ranks 9 of 67 Utah cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| West Valley City, UT | 3 mi | 2 | 5 | $128 |
| Taylorsville, UT | 3 mi | 2 | 5 | $128 |
| West Jordan, UT | 3 mi | 2 | 5 | $129 |
| Murray, UT | 6 mi | 2 | 5 | $163 |
| Midvale, UT | 7 mi | 2 | 5 | $163 |
| South Jordan, UT | 7 mi | 2 | 5 | $130 |