Page 2 of 4 FirstFirst 1234 LastLast
Results 14 to 26 of 50
  1. #14
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,187
    I see you are in GA, not sure where (and have not read your previous threads).

    If you are interested in a different set of eyes looking for issues with your system(s) (for a fee), look in my profile (click on my screen name) and send me an Email.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  2. #15
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,064
    If they didn't test the duct leakage before and after how do you know if they sealed it.

  3. #16
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by 545GAlady View Post
    Airfow was lowered by the tech to 825 cfm (825 cfm for the first 7 minutes then speed increases) and that didn't help solve the issue.
    Other issues aside, for a 2 ton system around 800 CFM should be the maximum airflow setting that the blower ramps up to.
    If more government is the answer, then it's a really stupid question.

  4. #17
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,412
    Quote Originally Posted by 545GAlady View Post
    We already have a solar-powered attic fan which has really brought down the attic temperature.
    .
    Not a good idea, Your cooling your attic at the expense of cooling and comfort in your home!
    Make your expertise uniquely valuable.

    Make your influence uniquely far-reaching.

  5. #18
    Join Date
    Sep 2012
    Posts
    373
    Quote Originally Posted by jimj View Post
    Not a good idea, Your cooling your attic at the expense of cooling and comfort in your home!
    Well what I mean is the attic is still very hot in the summer time but the attic helped lower temperatures a few degrees cooler. We have a large attic, and it's always hot during the warmer months.

  6. #19
    Join Date
    Sep 2012
    Posts
    373
    Quote Originally Posted by jtrammel View Post
    If they didn't test the duct leakage before and after how do you know if they sealed it.
    The contractor who was here last summer to quote us on the new furnace tested duct leakage and there was quite a bit and the ducts were never sealed. After the new furnace was installed, the installers sealed all of the ductwork.

  7. #20
    Join Date
    Sep 2012
    Posts
    373
    Quote Originally Posted by mark beiser View Post
    Other issues aside, for a 2 ton system around 800 CFM should be the maximum airflow setting that the blower ramps up to.
    The tech who was here for the A/C tune-up said he didn't want to lower airflow too much as it can affect the performance of the whole system.

  8. #21
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,412
    The problem with power attic ventilators is that they can cause large infiltration issues in the home, pulling your cooled air from the home into the attic only to be replaced with hot and humid outside sir ( infiltration).
    Make your expertise uniquely valuable.

    Make your influence uniquely far-reaching.

  9. #22
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,412
    As Mark has said 800 cfm is about the most you want in your climate. If your having any humidity issues 350 might be better.
    Make your expertise uniquely valuable.

    Make your influence uniquely far-reaching.

  10. #23
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,188
    going from R-6 to R-8 isn't going to save you much.
    large labor cost to replace flex or re-wrap hard pipe ducting.

    I'd suspect there is another issue, or several issues.
    I'm not going to search out your other postings as it is difficult
    to back & forth between older & current threads.
    Instead lets get some specific information in this thread to make
    it easier for all of us!

    how long have you been in the home?
    prior to system change out & duct sealing was second floor
    temps even? was second floor ever comfortable since you've lived there?
    is the 2 ton unit for the upstairs only? what approx sq ft is upstairs?

    does the second floor share walls with the attic of the house?
    are these walls insulated? if so, is it batt insulation?
    is there easy access to attic space & would you be
    comfortable taking some pictures for us?

    pics of walls of shared walls from attic side..pic of bathroom
    walls shared with attic, from attic side.
    if batts have been used, in the bathroom make sure that in tub/shower
    area that there is actually sheetrock behind the batts & not just the
    backside of the tub/shower unit.

    these will help us to better address your problems.
    and disconnect the pav, those things cause problems by
    pulling conditioned air out of house into attic. that is how
    they keep attics cooler. what type of attic venting do you have
    aside from pav? soffit & ridge vents? gable end vents? or just soffit
    & pav?

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

  11. #24
    Join Date
    Sep 2012
    Posts
    373
    Thanks for the input!

    We have been in the home since 2003 (one year after the house was built). No, there was no difference in temperatures upstairs before and after the sealing of the ducts. The upstairs has only been comfortable when the temperatures were less than 90*F outside. The upstairs is 1400 sq. ft. The old Lennox A/C was also a 2 ton. The system short cycles a lot (runs for about 5-10 minutes the majority of the time, unless it's very hot outside). Yes, the 2 ton only serves the upstairs. We have a total of 8 supplies (three 8 inch, two 6 inch, and three 4 inch supplies) and 5 returns (four 8 inch and one 10 inch on the return side).

    My daughter's room has high ceilings. The attic space is above the 2nd floor with a pull-down ladder for attic access. I'll take some pics tomorrow when I get a chance.

  12. #25
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,188
    are there walls of the second floor that are shared with the attic space??
    and it has never been comfortable upstairs when outdoor temps are higher than
    90 degrees...correct?

    think of this. if it is 90 degrees outside, it is 120-130 degrees in the attic.
    if the walls of the rooms on second floor are shared with attic space then
    the R-13-R-15 in the walls isn't stopping the heat transfer into the living space
    from the attic.
    this would make perfect sense that at above 90 degrees outside that upstairs
    would be hotter...because of extreme temp on other side of these shared walls.

    is there an easy access at first floor to attic space around second floor?
    it is the second floor walls on the attic side that interest me.

    you state you can't afford more attic insulation...but asked about replacing
    R-6 to R-8 ducts...do you really think insulation costs would be more than
    repalcing ductwork??

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

  13. #26
    Join Date
    Sep 2012
    Posts
    373
    Quote Originally Posted by energy_rater_La View Post
    are there walls of the second floor that are shared with the attic space??
    and it has never been comfortable upstairs when outdoor temps are higher than
    90 degrees...correct?

    think of this. if it is 90 degrees outside, it is 120-130 degrees in the attic.
    if the walls of the rooms on second floor are shared with attic space then
    the R-13-R-15 in the walls isn't stopping the heat transfer into the living space
    from the attic.
    this would make perfect sense that at above 90 degrees outside that upstairs
    would be hotter...because of extreme temp on other side of these shared walls.

    is there an easy access at first floor to attic space around second floor?
    it is the second floor walls on the attic side that interest me.

    you state you can't afford more attic insulation...but asked about replacing
    R-6 to R-8 ducts...do you really think insulation costs would be more than
    repalcing ductwork??

    best of luck.
    I appreciate the info, thanks. There is only one wall that shares with the attic, and that is the upper part of one of the walls in my daughter's room since the room has high ceilings. The upstairs does sometimes feel comfortable when its above 90*F. Mostly not. We had our attic insulation evaluated several times and everyone said there's enough. There's no other access point to the attic other than the pull-down ladder which is in the upstairs hallway.

    For adding more insulation, what I'm really saying is that we can't afford it at this very moment. However, it's something to think about in the near future.

Page 2 of 4 FirstFirst 1234 LastLast

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