Pool swim season in New Carrollton, MD
Swim season in New Carrollton without a heater, and with one
An unheated pool in New Carrollton reaches 78°F in Aug, about 1 month a year. The air allows up to 5 swimmable months with a heater (May to Sep).
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Heater options for a New Carrollton pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 1 | 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 | $204 | $754 |
| Gas heater + cover | 5 | May to Sep | $307 | $732 |
For a 450 sq ft pool held at 80°F, at MD prices of 21.3¢/kWh electricity and $16/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in New Carrollton
Solar panels + cover: 4 of 5 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 2 months 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: Glenn Dale Bell Station, 3.9 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
New Carrollton 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 | 44° | 33° | 2.2 | 34° | 40° | – | – |
| Feb | 47° | 35° | 3.0 | 34° | 40° | – | – |
| Mar | 55° | 43° | 4.0 | 40° | 46° | – | – |
| Apr | 66° | 54° | 5.1 | 50° | 56° | – | – |
| May | 75° | 63° | 5.8 | 61° | 67° | $164 | $242 |
| Jun | 83° | 72° | 6.4 | 71° | 77° | $36 | $59 |
| Jul | 89° | 77° | 6.3 | 78° | 84° | – | – |
| Aug | 87° | 76° | 5.6 | 79° | 85° | – | – |
| Sep | 79° | 68° | 4.5 | 74° | 80° | $4 | $6 |
| Oct | 68° | 56° | 3.4 | 63° | 69° | – | – |
| Nov | 57° | 45° | 2.5 | 50° | 56° | – | – |
| Dec | 48° | 37° | 1.9 | 40° | 46° | – | – |
Heating costs most in May (about $164 with a heat pump, $242 with gas). Sunshine peaks in Jun at 6.4 kWh/m²/day (NASA satellite data, 61.3 km grid cell). Highlighted months are swimmable with no heater.
How New Carrollton compares with nearby cities
New Carrollton ranks 16 of 23 Maryland cities for unheated swim months; Greenbelt, College Park, Hyattsville nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Greenbelt, MD | 2 mi | 2 | 5 | $173 |
| College Park, MD | 4 mi | 2 | 5 | $173 |
| Hyattsville, MD | 4 mi | 2 | 5 | $113 |
| Takoma Park, MD | 7 mi | 2 | 5 | $115 |
| Bowie, MD | 7 mi | 1 | 5 | $204 |
| Washington, DC | 9 mi | 2 | 5 | $134 |