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Thread: Update on new pool dark color vs light increase in temp San Diego

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    Update on new pool dark color vs light increase in temp San Diego

    Ok, Had my pool refinished from plain white plaster to Tahoe blue exposed aggregate finish. Last year July-August temps were approx 78 degrees at best in the dead of summer. At this time of year it was about 76-78

    I used the exact thermometer and not one other thing changed and temps are
    81 on same thermometer and 82.6 on new digital one. Pool is noticeably warmer. No it isn't a hot tub but less of that shock when you first get in. I am going to assume maybe a degree or more will be gained when in the middle of summer like last years above temps.

    So scientist, calculations, speculation, etc all I can do is report that for whatever reason my pool has seen a nice increase in temps. Figured I would report back for reference. I will update in late July.

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    bmoreswim's Avatar
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    Re: Update on new pool dark color vs light increase in temp San Diego

    I appreciate you having your pool refinished so we could find out the answer. So kind of you! But seriously, that is probably the perfect scenario to evaluate the difference given the consistent temps for that area as i understand them to be.

    Anecdotally I am amazed at how my pool will heat up on a sunny day with grey plaster.

    Thanks for your observations and i look forward to hearing back in July.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
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    wjr75's Avatar
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    Re: Update on new pool dark color vs light increase in temp San Diego

    Just had our pool refinished with Aqua Blue Pebble Sheen this year from white plaster. I've noticed a few degree difference than what was typical with the white plaster when our pool cover is open. The PB indicated to us some of the darker finishes would see a 4 degree difference than white plaster in the heat of the summer.
    Inground 22k gallon gunite 15x31 main pool, 15x7 wading pool/sunning deck, hot tub/with overflow (9' octagon with limestone top) & slide NSWG, Aqua Blue Pebble Sheen
    Filter dual cartridge Sta-rite 450sq/ft, TF-100 Test Kit
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    Re: Update on new pool dark color vs light increase in temp San Diego

    Wasn't San Diego unseasonably hot this spring? The only way to put this one to rest is to have two pools side by side with same dimensions exposed to exactly the same weather conditions.

    I too just switched to a Tahoe blue pebble finish from white and I think my pool is a little warmer as well, will be able to tell more by August since my max with white is about 94. I really hope I don't see 98 now...
    ~15K gal, IG gunite with new Wetedge Satin Matrix Pebble Finish installed mid 04/14, 1 HP Pentair Challanger pump, Sta-rite System 3 300 sqft cartridge filter, G3 cleaner

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    Richard320's Avatar
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    Re: Update on new pool dark color vs light increase in temp San Diego

    It makes perfect sense intuitively.

    I know when I rent a car in las Vegas, I always go for the white or silver since the dark colors absorb the heat instead of reflecting the sunlight.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad jblizzle's Avatar
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    Re: Update on new pool dark color vs light increase in temp San Diego

    Quote Originally Posted by Richard320 View Post
    It makes perfect sense intuitively.

    I know when I rent a car in las Vegas, I always go for the white or silver since the dark colors absorb the heat instead of reflecting the sunlight.
    Sure, but is getting into a white 130 degree F car that much better than a dark 140 F degree car?
    The actual interior temperature difference is 10 degrees at most ... It is hot getting into either
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: Update on new pool dark color vs light increase in temp San Diego

    Quote Originally Posted by jblizzle View Post
    Sure, but is getting into a white 130 degree F car that much better than a dark 140 F degree car?
    The actual interior temperature difference is 10 degrees at most ... It is hot getting into either
    Yes. The AC works faster.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad jblizzle's Avatar
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    Re: Update on new pool dark color vs light increase in temp San Diego

    You just need remote start
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Update on new pool dark color vs light increase in temp San Diego

    That's pretty interesting.

    how are air temps compared to last year?

    My brain gave me an estimation of 2-3 degrees difference. Looks like I was a little off, but "good enough for gov't work".

    A friend states they lose more water after going to a dark plaster due to evap. I'll be curious what your take on that is.
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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