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Thread: To cover or not to cover...

  1. Back To Top    #1

    Join Date
    Apr 2011
    Location
    Morgantown, WV
    Posts
    50

    To cover or not to cover...

    Our new pool has an APC auto pool cover. The fabric is a very heavy vinyl. I'm wondering if everyone thinks it makes more sense to keep it closed or leave it open to gain heat from the sun. Their website claims it acts as a solar cover also, but that fabric is so heavy, I'm not sure how well it would generate heat. I don't want to turn the heater on yet, since it is just still so chilly. But I'd like to take advantage of what few sunny days we are having.
    Thanks
    20x40 IG 30,000 Gal Vinyl
    Hayward 1HP Super Pump, Hayward Perflex D.E. filter, Hayward Universal H-Series 300K BTU heater, Hayward Aqua Rite SWG
    Hayward ColorLogic 4.0 LED Light
    Inter-fab X-Stream slide, Inter-fab Techni-Spring diving board
    APC Auto Safety Cover

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: To cover or not to cover...

    You definitely want to cover the pool at night. On a bright sunny day without too much wind you are usually better off having the cover open, though that depends somewhat on the humidity. Very low humidity causes more evaporation, which can cool the pool down.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: To cover or not to cover...

    I have a similar type of cover and agree with Jason. If the cover is very dark in color, then it will tend to absorb some heat from the sun and transfer some of it to the pool, but not a lot (a clear cover heats more during the day by letting light through). If it's a light colored cover, it will transfer even less heat because it reflects more light. With the pool cover open and with a white plaster pool, about 60% of the sun's energy will be absorbed by the water.

    I have solar panels for heating so don't open the cover during the day, but I have noticed that my newer dark blue cover heats the pool more than the earlier light tan cover.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  4. Back To Top    #4

    Join Date
    Apr 2011
    Location
    Morgantown, WV
    Posts
    50

    Re: To cover or not to cover...

    Our cover is the dark blue one. We don't have a fence and we have small children ourselves, so I'm hesitant to leave it open at all except when I'm out there right beside it. Even then I'm not sure it will be worth the hassle of opening and closing it every time I step away. I'm hoping the real benefit will be late in the season when it will help hold the heat in during some cool nights.
    20x40 IG 30,000 Gal Vinyl
    Hayward 1HP Super Pump, Hayward Perflex D.E. filter, Hayward Universal H-Series 300K BTU heater, Hayward Aqua Rite SWG
    Hayward ColorLogic 4.0 LED Light
    Inter-fab X-Stream slide, Inter-fab Techni-Spring diving board
    APC Auto Safety Cover

  5. Back To Top    #5

    Join Date
    May 2010
    Location
    Ottawa, ON, Canada
    Posts
    153

    Re: To cover or not to cover...

    You've got young kinds? Fence the pool area... don't rely on the cover!
    19.5k gallons in ground, P4 panel with turbocell SWG, 1hp Hayward superpump II, sand filter, Heater low nox 250k btu heater, solar cover on rocky roller

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