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  1. a few things. first this. perfect common sense...

    a few things.

    first this. perfect common sense answer...
    "It takes two to three times the power to start a unit than to run it. So if you're starting and stopping these units more often, then...
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    is master bedroom door closed at night? it may...

    is master bedroom door closed at night?
    it may be a return air issus..lack of r/a I should say?

    adding dampers after new ductwork install
    and after new insulation...going to be a pita!

    best...
  3. ditto. check returns for duct leakage. I'd start...

    ditto.
    check returns for duct leakage. I'd start by
    going into the attic & feeling for leakage, cold spots
    on ducts/plenums and wet insulation. (depending on
    your climate)

    in my hot humid...
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    it could be panned joist returns. hard to say...

    it could be panned joist returns.
    hard to say without seeing any pics.
  5. this is such a good post. good stuff Teddy...

    this is such a good post.

    good stuff Teddy Bear!!

    although I had to think about that filter restriction comment
    for a minute or two.
  6. ducts are usually hard pipe or flex. I've never...

    ducts are usually hard pipe or flex.
    I've never seen duct board ducts, just
    supply & return plenums.

    all are good materials when installed correctly.
    problems are when the materials are...
  7. well then if he simply disconnected & reconnected...

    well then if he simply disconnected & reconnected the return
    then it couldn't possibly have any leakage.

    when working in attics, things often
    get bumped & banged into. seals get broken without...
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    be prepared to find the leakage areas. crawling...

    be prepared to find the leakage areas.
    crawling around the eaves of the attic
    feeling for air with your can of spray paint.

    and if the leaks are big...try to avoid the
    paint being blown into...
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    you'll get better humidity control with the...

    you'll get better humidity control with the variable speed ahu.
    in our hot humid climates it is an excellent upgrade.

    worth every penny.

    lower air speed will give you more dehumidification,...
  10. second thread by same OP

    second thread by same OP
  11. it happens. we have all had bad tstats. hope...

    it happens.

    we have all had bad tstats.
    hope your problems are solved.

    best of luck.
  12. I can't see it from here. so the r/a is in the...

    I can't see it from here.
    so the r/a is in the dining room.
    ceiling or wall?

    never mind.

    this is what you might want to consider.

    when the unit was replaced, they may
    not have properly...
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    3 kids under 5 add a lot of air changes per hour....

    3 kids under 5 add a lot of air changes per hour.
    much different if it were an older couple who stayed
    inside a lot.

    that said...I'm a big fan of ultraire dehumidifiers.
    I have one in my home,...
  14. I know that area! so, where is the return air...

    I know that area!

    so, where is the return air for the 4 ton system located?
    return air leakage contributes to high RH.

    with the install of the new system,
    something may have changed with the...
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    have the house tested with a blower door. this...

    have the house tested with a blower door.
    this will measure air leakage & a calculation
    can be done to convert into air changes per hour.

    from that the amount of fresh air needed can be...
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    rafter faces covered at at least an inch over...

    rafter faces covered at at least
    an inch over the faces & between joists 7" of R-4 open cell foam
    is R-28 close enough in my hot humid climate.

    understand the pricing of foam insulation.
    the...
  17. so, there were no issues with the old systems,...

    so, there were no issues with the old systems, correct?
    only when the 4 ton system was replaced did the floor
    begin cupping?

    where is the return air for the 4 ton system located?

    aside from...
  18. mastic is a product for duct sealing. acca...

    mastic is a product for duct sealing. acca approved UL rated.
    comes in a bucket & is applied with a brush.
    good for indoor or outdoor use. great product.

    vstech, you wrote:
    silicone is a no no...
  19. I wonder if the ducts are sized for three tons...

    I wonder if the ducts are sized for three tons and not four tons.
    missed system size in first post.
    thanks for pointing that out Ranger!
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    just make sure that the R-value equals the...

    just make sure that the R-value equals the required amount.
    you want the rafters fully filled, rafter faces covered at at least
    an inch over the faces & between joists 7" of R-4 open cell foam
    is...
  21. you should invest in duct leakage testing. this...

    you should invest in duct leakage testing.
    this is a method of testing ducts with a duct blaster,
    or a blower door which is also used to test the whole house.

    if you get the right person to do...
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    I'd go for the foam sealed unvented semi...

    I'd go for the foam sealed unvented semi conditioned attic.
    just make sure roof decking is in good condition first.

    it would drastically change the comfort of the
    upstairs rooms that share attic...
  23. glad you kept the unit out of the attic. bad...

    glad you kept the unit out of the attic.
    bad enough that the ducts are up there.

    can you give us the model numbers from the
    condensing unit outside? that will tell us the
    size & thus the amount...
  24. I missed the part where you said you could add...

    I missed the part where you said you could add another
    r/a on the other side. might be the easiest solution.
    but still...air seal that return!!

    best of luck
  25. As a home warms, the %RH drops about 2.5%RH per...

    As a home warms, the %RH drops about 2.5%RH per 1^F temperature rise.

    exactly what I was thinking!
    thanks TB!!

    I've done quite a few diy experiments from
    things I've read here.
  26. in hot humid climates the fan on continuously...

    in hot humid climates the fan on continuously
    will pick up the moisture removed & redistribute
    it through out the house, raising indoor RH.
  27. depends upon the location. we sacrifice...

    depends upon the location.
    we sacrifice dehumidification for higher SEER
    while this may work well in other climates,
    in hot humid climates higher SEER doesn't
    assure comfort or affordability of...
  28. what size system do you have & what size is the...

    what size system do you have & what size is the r/a filter grill?

    you have room to increase the r/a filter grill & filter.

    oh I see...16x24. you can't have too much return.
    my 2 ton system has...
  29. don't use foam in the return. I'd start by...

    don't use foam in the return.

    I'd start by lining the return as suggested above,
    with duct board.
    sides & bottom should be covered with ductboard
    with fg side facing into the return to absorb...
  30. I make a good living fixing duct that others have...

    I make a good living fixing duct that others have mis-installed.
    my own opinion is that low man on the crew runs duct.
    no training, just getting it done between trips for techs.

    there are air...
  31. with high humidity & temps of florida, you will...

    with high humidity & temps of florida, you
    will need humidity removal.
    oversized hvac systems will have shortened
    run times & less humidity removal.

    avoid rule of thumb sizing (the old 500 sq...
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    I'd start by sealing some stuff up. use thumb...

    I'd start by sealing some stuff up.
    use thumb gum (rope caulking) around the plumbing
    pipes.
    weatherstrip the attic access.
    add a piece of 2x4 to the attic side of the hatch
    to weight it down.
    ...
  33. somehow I thought I'd seen a picture, maybe...

    somehow I thought I'd seen a picture, maybe another
    thread or forum.

    best idea would be build a fur down for the duct.
    then get full insulation depth in the rafter bay.
    any way that would work?
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    you will need to go beyond a free or minimal cost...

    you will need to go beyond a free or minimal cost energy audit.
    start here:
    http://www.resnet.us/energy-rating

    make sure your rater has experience in existing homes &
    solving comfort issues....
  35. glad you enjoyed your trip! going to get hot in a...

    glad you enjoyed your trip! going to get hot in a couple of months,
    so you had good timing!!

    sheet metal duct would take up less space.
    I'd go custom fabrication.
    8" moves 175-200 cfm
    you...
  36. chances of critters coming into your house...

    chances of critters coming into your house through the
    opening are pretty small...
    but there is a cost associated with the situation
    that you pay for monthly.
    most landlords aren't concerned with...
  37. Ideally the top of the closet would be closed & a...

    Ideally the top of the closet would be closed & a combustion
    air vent installed from attic, through top of closed closet
    and to the lower part of the unit.
    this opening would be caulked to air...
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    we can't get into lawsuits here. good luck, but...

    we can't get into lawsuits here.
    good luck, but don't mention it too much
    or the thread will be closed.

    best of luck.
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    don't use bleach, its never a good idea. is this...

    don't use bleach, its never a good idea.
    is this a/c with electric strip heat or a/c with gas furnace?

    if a/c with electric strip you should look into
    a heat pump. elec strip is the most...
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    glad you are imparting your wisdom to the next...

    glad you are imparting your wisdom to the next generation classical!
  41. let us know what you find out. best of luck.

    let us know what you find out.

    best of luck.
  42. what temp are you trying to achieve & what is...

    what temp are you trying to achieve
    & what is your location?

    houses aren't perfectly sealed.
    you should have a blower door infiltration number
    based on air changes per hour.
    sharing that...
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    again...what location?

    again...what location?
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    take the buyout. it may be cheap entertainment...

    take the buyout.
    it may be cheap entertainment when sitting
    at our computers in out cool houses reading about it...
    but homeowner is the one sweating it out.
  45. do you really think you'd notice it after a...

    do you really think you'd notice it after a while,
    if the ceiling was furred down a few inches?

    I totally don't get the cc for walls oc for ceilings...
    makes no sense to me.
    in cold climates cc...
  46. X2 seal the house, seal the ducts & returns. ...

    X2
    seal the house, seal the ducts & returns.

    best of luck!
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    glad the article set your mind to rest. with...

    glad the article set your mind to rest.

    with the foam sheating on the exterior of walls,
    you can use any insulation.
    roxul is expensive, I'd compare it to unfaced fg batts,
    if it is the R15...
  48. X2 on that! thanks for the update & glad you...

    X2 on that!

    thanks for the update & glad you are satisfied.
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    ok guys... reign it in. Hi Annie, I'm proud...

    ok guys... reign it in.

    Hi Annie,
    I'm proud of you too that you didn't punch him. good for you.

    don't leave fan set to on. in hot humid climates it will
    evaporate the moisture off the coil...
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    just wanted to say, jtrammell, your posts...

    just wanted to say, jtrammell, your posts were/are
    very good. you clarify things nicely.
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