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  1. #1
    Join Date
    Jul 2005
    Posts
    1

    Question

    I am trying to get quotes on central air being installed at my home. I currently only have natural gas heating with a furnace in the garage and all of the vents are in the floors on the upper level. (garage is under house near basement). I am getting mixed answers. Will central air work with small floor vents and what size unit should I have installed.
    Thanks
    Shawn

  2. #2
    Join Date
    Jul 2003
    Location
    Massachusetts
    Posts
    288
    it can work. size will be determined by installer.

  3. #3
    Join Date
    Aug 2004
    Location
    Tyler TX
    Posts
    676
    You may have to get a mobile home unit that has a high static blower but you still have some limitation at that. Finding a good contractor will solve your problem.
    HVAC Contractor, Tyler Texas.

  4. #4
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    Floor supply vents are the rule in Colorado. Sometimes they work; sometimes they don't. The ones that don't work usually have inadequate air flow. This allows the air to just flow across the floor to the nearest return -- or down the stairs to a lower floor. Good throw and adequate mixing with room air is essential.

    I've never seen an ACCA Manual T, but I suspect it discusses floor supply vents.

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,151
    Very common in many parts of the country. Having high returns is important. If you have low returns, the cold air will hug the floor and it will be warm from a few feet off the floor to the ceiling.

  6. #6
    Join Date
    Dec 2004
    Posts
    441
    Floor registers only work south of the equator, this why they have high return ductwork. The same rule also applies in Colorado. Seeming they think so highly of themselves the supply registers are in the floor. Colorado plumbers have figured out that cr@p can run uphill with the adequate amount of sophistication.

  7. #7
    Join Date
    Jul 2003
    Location
    Philadelphia Pa.
    Posts
    461
    I am a home owner and have CA with floor vents. I live in a 3 story house with the living room on the first floor having 13ft ceilings and the masterbedroom suite on the 2 1/2 floor having 14ft ceilings.

    Every room has it's own return and in the living room and all rooms on the 2nd and 3rd floors the returns are near the ceiling. the Masterbedroom has returns at the floor and ceiling. All of the hall ways on each floor also have returns in the walls close to the floors.

    The floor vents are small in smaller rooms. Larger rooms have larger vents and some of them have two vents in the floor on each side of the room instead of just one.

    It was 99 here today witih high humidity and tonight at midnight it is currently 87. Inside the first floor is 73 and the masterbedroom is 72. Bedrooms in the 3rd floor are 73, so yeah i guess it can work. I think air flow is important. In the room farthest away from the blower unit, the air flow pulled from the return is strong enough to suck and hold at least 3 sheets of copy paper against the return vent which is near the ceiling, so there IS air moving.

    The house was designed and constructed with heat/CA vents coming from the floor so I think proper design and installation will be critical to your success.




  8. #8
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    What's with all the picking on Colorada? I would think in most places of the US and Canada heating is far more of a priority than cooling. It is very common to have the vents in the floor.
    "Go big or Go Home"

  9. #9
    Join Date
    Dec 2004
    Posts
    441
    I'm not from Texas, but I'd rather move to Texas if it became the ultimate right to pick on people from Colorado! I would only go to Colorado to visit relatives, otherwise look for a vacation in Texas. Maybe it has to do with the lack of oxygen in the upper altitudes that makes it sound like a bunch of whiners up there!

  10. #10
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    We're in Florida,thousands and thousands of manufactured home(mobiles),with floor supplies and floor or low wall returns .They work just fine.


    IF the supply grilles and the units fan motor can "throw" (push) the supply air to 6' ,approx. above the floor.


    Check Manuals ,T and D and you'll see there is no reason it cnot work properly,if designed properly.


    Now in this case we have existing ducts ,that were installed originally as heating only,so they need to be evaluated by a Pro,to determine ,If they are adequate or not.

    The floors grille need to be the type that directs the air stright up in most cases.




    Where are you located and what's the model number of the furnace,and tonnage of A/C planned?

  11. #11
    Join Date
    Dec 2002
    Location
    Rochester, MN
    Posts
    5,304
    Pretty much all homes with basements, the supply vents are on the floor, or baseboards in old homes and works fine.. LIke most already said, as long you got good air "throw" and returns, should not be a problem.

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