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  1. #1
    Join Date
    Apr 2007
    Location
    Loris SC
    Posts
    208

    AC built into duct????

    I recentinly helpled my dad change out his 1950's furnace with a new 90% gas setup. The Question I have is for the residential pro'S IS CAN I SIZE AC DUCTS TO CARRY WHATC HE NEEDS IN BOTH AC/HEAT APPLICATION'C????

  2. #2
    Join Date
    May 2004
    Location
    Austin, TX
    Posts
    1,733
    Depends on your duct work, a/c requires more air volume that heat.

    You could always do a Manual D. Duct work being from the 50's most
    likely duct work is to small for a/c.

  3. #3
    Join Date
    Dec 2004
    Location
    Derby City
    Posts
    3,964
    Read site rules. No DIY issues can be dealt with.
    Everyone has a purpose in life..........even if it's to be a bad example.

    Seek first to understand, before seeking to be understood.

  4. #4
    Join Date
    Jan 2004
    Posts
    48
    The question should read "may I size ducts for both heat and AC?" Yes but can you?
    Class of 70

  5. #5
    Join Date
    Jun 2005
    Posts
    274
    Quote Originally Posted by refertecbd View Post
    I recentinly helpled my dad change out his 1950's furnace with a new 90% gas setup. The Question I have is for the residential pro'S IS CAN I SIZE AC DUCTS TO CARRY WHATC HE NEEDS IN BOTH AC/HEAT APPLICATION'C????
    Yes, it happens all the time, but you must have the correct sizing for A/C.
    Never seen a house with an a/c duct and a seperate duct for heat.

  6. #6
    Join Date
    Apr 2007
    Location
    Loris SC
    Posts
    208
    Hay Irish I'm a 10 year Refrigeration guy dont do much residetial Thanks for the help

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,069
    Yes you can.

    The ducts must be sized to the higher air flow requirment weather its for heating heating or cooling.
    In my area, its almost always the A/C that needs the most air flow. But once in awhile its the heat.

    But we can't discuss any more detail then thatg in the open resi forum.

    Apply for pro membership.
    Contractor locator map

    How-to-apply-for-Professional

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

  8. #8
    Join Date
    Dec 2007
    Posts
    132
    Of course you can put in an A/C coil ,I can't figure out why everyone on this site is so hesitant to help. All you have to focus on is the return duct if the supply has been there from the 50's Great it has worked for a long time onlt issue with supply is make sure it is sealed and maybe insulate it,other than that you might have velocity a little high ,but hey you cant have everything right.The key is you can never have to much return air ,It wouldnt hurt to add some ,the system was probably sized for heat only back then,So put in your coil ,seal &wrap add some return & new t-stat and enjoy!!!

  9. #9
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,176
    Quote Originally Posted by Dog View Post


    Of course you can put in an A/C coil ,I can't figure out why everyone on this site is so hesitant to help.

    Because you guys don't read the rules! READ THE RULES! NO DIY! There is a forum for this, it's the Professional Technical Forum.

    There is a link to the forum rules as well as a link to apply for pro membership in my signature line.

    We do not want specific step by step instructions in the open forum where Joe Homeowner can see what's going on, try it himself, fail and blow his butt to Kingdom Come!

  10. #10
    Join Date
    Dec 2007
    Posts
    132
    Relax Bob the man is a pro asking for advise he is doing ref not gas piping ,Why would he blow his own fathers house up?

  11. #11
    Join Date
    Dec 2007
    Posts
    89
    effiency!thats what u need to focus on, I would advise u to get a contractor over ASAP!

  12. #12
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,688
    Quote Originally Posted by Dog View Post
    Relax Bob the man is a pro asking for advise he is doing ref not gas piping ,Why would he blow his own fathers house up?
    I’d suggest you relax and reread the site rules also.

    HeyBob’s qualifications aren’t in question. Yours are.

  13. #13
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,176
    Quote Originally Posted by pecmsg View Post
    I’d suggest you relax and reread the site rules also.

    HeyBob’s qualifications aren’t in question. Yours are.


    Thanks!

    Dog..........read the rules. I am the kindler gentler Moderator!

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