Results 1 to 11 of 11
  1. #1
    Join Date
    Aug 2012
    Posts
    83

    Will painting home's walls really give me 11% decreased energy bill?

    http://www.ba-pirc.org/media/pdf/Ref...ls_DParker.pdf
    This study seems to say painting them white will do so.
    If you live in Florida and your AC energy bill is $2400 a year than that is $240 in energy savings or $20 a month.

    Obviously that's not enough of an energy savings to actually make it worth repainting your home, but if you are going to repaint anyways, why not make it white?

    Intuitively it sounds a little high. Any real world experience with this?
    Last edited by newstudent; 10-03-2012 at 10:30 PM. Reason: should of added WHITE to the subject sorry!

  2. #2
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,802
    If you painted the outside of your house white... Maybe.

  3. #3
    Join Date
    Mar 2004
    Location
    Des Moines, Iowa
    Posts
    147
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 10-04-2012 at 04:24 PM. Reason: Non Pro * Member

  4. #4
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,325
    Put a white reflective roof on your house, and with ducts in the attic you will see a noticeable drop in electric usage to keep your house cool in summer. Paint all of the exterior walls white...if you have unshaded walls of your house, or large sections that face east or west, a lighter color could help reduce the intensity of heat transfer into the house in summer. As to what extent, that would require modeling to get an approximation.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  5. #5
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,325
    Rebehanish, you need to apply for pro membership and further apply for AOP privileges to post here. I'm not a moderator but I am saying this for your benefit. Your postings in this section will be deleted at some point by a mod, just so you know.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  6. #6
    Join Date
    Mar 2004
    Location
    Des Moines, Iowa
    Posts
    147
    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Further infractions may result in loss of posting privileges.
    Last edited by beenthere; 10-04-2012 at 04:24 PM. Reason: Non Pro * Member

  7. #7
    Join Date
    Aug 2012
    Posts
    83
    "I'd be interested in how they come up with that one. Anyway how could you prove that 11%rate? "

    Just read the link in the original post. They did a study over several months on a mock up home.

    What I found particularly amazing is this shed already had a white roof on it and the walls were a very light tan color, and yet they still reported this improvement. FSEC is known for the quality of their building science reports, and they are not some paint manufacture trying to sell you something either.

  8. #8
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,325
    Newstudent, my advice to rebehanish applies to you as well.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  9. #9
    Join Date
    Aug 2012
    Posts
    83
    your advice is misguided I started this thread and am not breaking any forum rules that I am aware of.

  10. #10
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,164
    for unshaded properties,
    sun hits roof all day.
    sun hits walls one wall at a time for
    lesser hours than roof.
    white roof has better savings, walls
    lesser savings.

    in remrate we enter roof info (light reflective medium dark) and exterior
    wall info (light medium dark). I've never broken it down by changing
    wall info to see what exactly it saves to go with lighter colors.
    11% doesn't seem far off though.
    a lot would depend on wall size, orientation & exterior shading.

    but if you are re-painting..lighter is better for cooling climates.
    I'd like to repaint my house soon, well after the
    last 4 windows are repaired.
    originally I wanted a red ..18 years ago when I first moved in.
    now I'm leaning towards a cream color.
    with dual colored trim.

    if you are repainting take advantage of every money saving
    thing you can.
    taking the time to do the prep work, caulk well before paint
    & investing in quality paint. help the paint job to last longer.

    best of luck.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,910
    Quote Originally Posted by newstudent View Post
    I started this thread and am not breaking any forum rules that I am aware of.

    You are correct, your not breaking any rules.

    Of course, if you give me a couple minutes I can make a rule up so you are. LOL
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event