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Electrical Savings After Insulation Install

Discussion in 'Dumaguete City' started by Rye83, Oct 25, 2021.

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  1. Rye83

    Rye83 with pastrami Admin Secured Account Highly Rated Poster SC Connoisseur Veteran Army

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    Just received my electrical bill a full month after having insulation installed.

    My highest bill prior was P8,100+. This was a hot month of nothing but sun.

    Previous bill, being a rather rainy month, was P5,000.

    Current bill, with the weather being similar to last month, is P3,700.

    Temperature set to 25°C night and day.

    Total material and installation fee was P12k. Landlord covered half the cost so I'm was only out P6k.

    If my math is correct it will take roughly 4.5 months to get a ROI (9 months if I had paid full price). Assuming last month's electricity usage was pretty similar to this month, which I think it was, that's about a 25% savings (again, if my math is correct).

    I've noticed my air-con running much less frequently, with it rarely, if ever, coming on at night, and the house feels much cooler (even the rooms I don't air-con). Another perk is that I don't have to blast the tv volume every time there is a light rain. Well worth the investment.
     
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    Rye83, Oct 25, 2021
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  2. Show Pony

    Show Pony DI Forum Patron Highly Rated Poster Showcase Reviewer

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    If you have your old electric bills then just compare the kWh consumed.
     
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    Show Pony, Oct 25, 2021
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    Rye83

    Rye83 with pastrami Admin Secured Account Highly Rated Poster SC Connoisseur Veteran Army

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    Previous 4 bills:
    530 kWh - P5,845.71 (P11.02/kWh)
    706 kWh - P8,197.57 (P11.61/kWh)
    431 kWh - P4,928.18 (P11.43/kWh) *~1 week with insulation
    388 kWh - P3,785.05 (P9.75/kWh?) *Full month with insulation

    What am I screwing up here? Did the rates drop that much?
     
    Rye83, Oct 25, 2021
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  4. SkipJack

    SkipJack DI Senior Member

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    Where was the insulation installed? What type of insulation?
     
    SkipJack, Oct 25, 2021
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  5. JWBobbit

    JWBobbit DI Member

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    My commercial rate dropped this month back to the same price as March and April rates. 9 PHP/kWh
     
    JWBobbit, Oct 25, 2021
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    Rye83

    Rye83 with pastrami Admin Secured Account Highly Rated Poster SC Connoisseur Veteran Army

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    Screenshot_20211025-212424.png
    That's what it looked like before installation. It went under the roofing. Landlord handled the logistics so I'm not exactly sure on the type.
     
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    Rye83, Oct 25, 2021
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  7. Show Pony

    Show Pony DI Forum Patron Highly Rated Poster Showcase Reviewer

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    Yes the rates dropped a lot.
    Noreco was charging customers for something they should not have. I think they were trying to retire some debit or other.
     
    Show Pony, Oct 25, 2021
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  8. Notmyrealname

    Notmyrealname DI Forum Luminary Highly Rated Poster Showcase Reviewer

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    This is all good stuff and many would consider doing the same for such a large reduction in energy bill.

    I also wonder about having a hole cut in the roof and having a vent installed at the top most point. Of course the vent has to be protected from ingress of rain and as many types of animals as possible.

    The issue that bothers me most is having a local 'builder' cut my roof and install a vent, only to fail to waterproof the joint properly. Has anyone had such a vent installed (or had one on the house when they bought it) or know of reasons why this is not a good idea?
     
    Notmyrealname, Oct 25, 2021
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  9. Dutchie

    Dutchie DI Forum Patron Highly Rated Poster Showcase Reviewer Veteran Army

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    I'm by no means an expert but I'm thinking that such a (basically ventilation) measure might/should work to reduce the temps in the house during the hottest parts of the day, but am not so sure it would work when combined with aircon. Because yes, the warmest air will still rise to near the top of the roof, but if your rooftop ventilator pushes out more air than the airflow that the aircon provides then any and all non airtight other spots in the house will start sucking in hot air from outside (think doors etc.).
     
    Dutchie, Oct 25, 2021
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  10. Notmyrealname

    Notmyrealname DI Forum Luminary Highly Rated Poster Showcase Reviewer

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    The roof is sealed from the living area of the house and so my thinking is that the very hot air in the roof-space would go out of the top vent (by natural methods and not assisted by a fan) and new (relatively cooler) air would come in via the vents in the soffits. This should cool the ceilings and so make the house cooler.

    If the house has an open roof (i.e. no ceilings) then the aircons will create a cool level of air lower down (due to the density of cold air) and push the hot air higher and out of the vent (that cool air is not likely to reach the vent itself) - but if I was doing that I would think more about the flows. My idea is for a house with ceilings and a separate roof space.
     
    Notmyrealname, Oct 25, 2021
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