Pool swim season in New Brunswick, NJ
Swim season in New Brunswick without a heater, and with one
An unheated pool in New Brunswick never reaches 78°F in a normal year. It peaks around 77°F in Aug. The air allows up to 5 swimmable months with a heater (May to Sep).
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What each heater buys you in New Brunswick
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $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 | $311 | $861 |
| Gas heater + cover | 5 | May to Sep | $361 | $786 |
For a 450 sq ft pool held at 80°F, at NJ prices of 24.1¢/kWh electricity and $14/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in New Brunswick
Solar panels + cover: 4 of 5 possible months for about $283 a year all-in, which works out near $71 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 3 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: NEW Brunswick 3 SE, 1.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
New Brunswick 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 | 40° | 32° | 1.9 | 33° | 39° | – | – |
| Feb | 43° | 33° | 2.8 | 32° | 38° | – | – |
| Mar | 51° | 41° | 3.7 | 38° | 44° | – | – |
| Apr | 63° | 52° | 4.9 | 48° | 54° | – | – |
| May | 72° | 61° | 5.4 | 59° | 65° | $221 | $249 |
| Jun | 81° | 71° | 6.0 | 69° | 75° | $65 | $82 |
| Jul | 87° | 76° | 6.0 | 77° | 83° | – | – |
| Aug | 85° | 74° | 5.2 | 77° | 83° | – | – |
| Sep | 78° | 67° | 4.3 | 72° | 78° | $25 | $30 |
| Oct | 67° | 55° | 3.0 | 61° | 67° | – | – |
| Nov | 56° | 45° | 2.2 | 50° | 56° | – | – |
| Dec | 45° | 37° | 1.6 | 40° | 46° | – | – |
Heating costs most in May (about $221 with a heat pump, $249 with gas). Sunshine peaks in Jul at 6.0 kWh/m²/day (NASA satellite data, 4.9 km grid cell). Highlighted months are swimmable with no heater.
How New Brunswick compares with nearby cities
New Brunswick ranks 71 of 116 New Jersey cities for unheated swim months; Metuchen, South Plainfield, Middlesex nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Highland Park, NJ | 1 mi | 0 | 5 | $311 |
| South River, NJ | 4 mi | 0 | 5 | $311 |
| Metuchen, NJ | 6 mi | 1 | 5 | $246 |
| South Plainfield, NJ | 6 mi | 1 | 5 | $246 |
| Sayreville, NJ | 7 mi | 0 | 5 | $311 |
| Middlesex, NJ | 7 mi | 1 | 5 | $246 |