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Thread: Does Running the Pump Cool the Pool Water?

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    Does Running the Pump Cool the Pool Water?

    Our pump puts out a pretty good swirl in our small pool.
    So we wonder if it cools the water, when run during the day?
    We don't need it to be cooled. Brrrr.
    We're having a lovely summer, but not a lovely summer for swimming, most days.
    ABG, Cornelius, 12'x24', oval, 7,700 gals, 1 1/2 hp Hayward pump, sand filter. BBB. 6-4'x10' Fafco solar panels, permanently installed on wooden ground rack, GL235 auto controller.

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    Re: Does Running the Pump Cool the Pool Water?

    I don't think so.. most heat loss is generally attributed to cooler temps at night.
    2003 Coleman MAAX Collection Model 706 - 400gal

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    Join Date
    May 2007
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    Re: Does Running the Pump Cool the Pool Water?

    hmm.... good question.

    With no scientific backing... I think if I wanted to warm my pool, if I could get away with it, I'd do my pump cycle at night... and let the sun try to warm the water during the day.

    Seems to me that the temp would increase the most without circulation... kinda like us sitting around in the sun without a fan blowing or a breeze.

    Good luck!!

    Steve
    18,000 gallon gunite free form, with spa, 4x160, EasyTouch, SWCG, Pentair cartr filter, Colorlogic lights.

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    JasonLion's Avatar
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    Re: Does Running the Pump Cool the Pool Water?

    The pump has very little effect on water temperature, other than mixing deep water with water higher up. To a small extent running the pump can increase surface agitation, which can increase evaporation, but the effect would normally be very small.

    Of course, if you have solar panels it is an entirely different story. Solar panels heat during the day and cool at night.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Mod Squad JohnT's Avatar
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    Re: Does Running the Pump Cool the Pool Water?

    My guess is that if you want warmer water, run the pump all the time. My reasoning is that if you don't run the pump, the surface water will be warmer than the rest of the pool. This will result in more heat loss when the air is cooler (at night), and less heat gain when the air is warmer (during the day) since heat transfer increases with temperature difference.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Does Running the Pump Cool the Pool Water?

    Thank you.
    We've been working on Steve's theory.
    Our air temp has not, necessarily, been much warmer than our pool water.
    Then add the 10-12 mph breeze, cloudy and you've got a dang
    chilly swim, for me
    ABG, Cornelius, 12'x24', oval, 7,700 gals, 1 1/2 hp Hayward pump, sand filter. BBB. 6-4'x10' Fafco solar panels, permanently installed on wooden ground rack, GL235 auto controller.

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