Dumaguete Info Search


  1. Sorry for the disruption

    We were in the process of relocating the DI website to a new server when we lost power overnight. Unfortunately we were unable to restore the server until now. The transfer has been completed and currently 2 web servers are serving the DI site - the old server displays this message. As DNS caches update, users will begin to filter onto the new server - you will know this has happened by the absence of this notice. Please note - any new posts posted to this server will not make it onto the new server.
    Details of how to speed up the DNS cache update on your computer are here: https://www.pcmag.com/how-to/how-to-flush-your-dns-cache
    Dismiss Notice

Electrical Savings After Insulation Install

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

  1. Rye83

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

    Messages:
    12,833
    Trophy Points:
    451
    Occupation:
    FIRE
    Location:
    Valencia
    Ratings:
    +15,694 / 3,736
    Blood Type:
    O+
    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.
     
    • Like Like x 3
    • Informative Informative x 2
  2. Show Pony

    Show Pony DI Forum Patron Highly Rated Poster Showcase Reviewer

    Messages:
    1,376
    Trophy Points:
    371
    Ratings:
    +2,143 / 1,199
    If you have your old electric bills then just compare the kWh consumed.
     
    • Like Like x 1
    • Agree Agree x 1
  3. OP
    OP
    Rye83

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

    Messages:
    12,833
    Trophy Points:
    451
    Occupation:
    FIRE
    Location:
    Valencia
    Ratings:
    +15,694 / 3,736
    Blood Type:
    O+
    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?
     
  4. SkipJack

    SkipJack DI Senior Member

    Messages:
    814
    Trophy Points:
    231
    Ratings:
    +1,082 / 78
    Blood Type:
    I don't know.
    Where was the insulation installed? What type of insulation?
     
  5. JWBobbit

    JWBobbit DI Member

    Messages:
    65
    Trophy Points:
    46
    Ratings:
    +141 / 0
    My commercial rate dropped this month back to the same price as March and April rates. 9 PHP/kWh
     
  6. OP
    OP
    Rye83

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

    Messages:
    12,833
    Trophy Points:
    451
    Occupation:
    FIRE
    Location:
    Valencia
    Ratings:
    +15,694 / 3,736
    Blood Type:
    O+
    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.
     
    • Thanks Thanks x 1
  7. Show Pony

    Show Pony DI Forum Patron Highly Rated Poster Showcase Reviewer

    Messages:
    1,376
    Trophy Points:
    371
    Ratings:
    +2,143 / 1,199
    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.
     
  8. Notmyrealname

    Notmyrealname DI Forum Luminary Highly Rated Poster Showcase Reviewer

    Messages:
    4,477
    Trophy Points:
    356
    Ratings:
    +5,040 / 2,700
    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?
     
  9. Dutchie

    Dutchie DI Senior Member Showcase Reviewer Veteran Army

    Messages:
    519
    Trophy Points:
    191
    Location:
    Dumaguete
    Ratings:
    +971 / 89
    Blood Type:
    A+
    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.).
     
  10. Notmyrealname

    Notmyrealname DI Forum Luminary Highly Rated Poster Showcase Reviewer

    Messages:
    4,477
    Trophy Points:
    356
    Ratings:
    +5,040 / 2,700
    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.
     
Loading...