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  1. #1
    Join Date
    Apr 2017
    Location
    Massachusetts
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    Which one is more efficient?

    Is High Velocity more efficient than conventional system?

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
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    39,428
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    If you look at SEER ratings, high velocity kills them. That's why they got a loophole around the 13 SEER minimum. There can be cases of a "16 SEER" or higher outdoor unit (matching indoor) that only gets 12 or 13 SEER with a Space Pak or Unico. Also watch capacity, usually end up losing about 1/2 a ton. An 036 might be rated at 30K with a HV air handler.

  3. #3
    Join Date
    Sep 2007
    Location
    State College, PA
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    2,350
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    Not quite an answer but...

    The problem I have seen with high velocity is that it does not do well to get rid of humidity. Others may have different experience in different areas of the country.
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  4. #4
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    3,371
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    Quote Originally Posted by joemach View Post
    Not quite an answer but...

    The problem I have seen with high velocity is that it does not do well to get rid of humidity. Others may have different experience in different areas of the country.
    Most systems run about 300cfm/ton and from my experience it is just the opposite, they have far more latent removal and less sensible

    'The more you know, the more you realize you don't know'
    ...

  5. #5
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,967
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    When 10 SEER was the norm, high velocity systems only got 9 SEER. When the minimum SEER went to 13, high velocity would only do 10 to 12 SEER. Capacity is almost always lower too. But sometimes there is no room for normal sized ducts, so high velocity is all that you can use. But standard systems are almost always better performing than high velocity systems.
    Remember, Air Conditioning begins with AIR.

  6. #6
    Join Date
    Nov 2014
    Location
    Chicago Illinois
    Posts
    214
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    Yeah I have noticed the same thing with Ave last three systems they don’t do very well with removing humidity

  7. #7
    Join Date
    Aug 2018
    Posts
    17
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    I saw a unit that said its a Hydrocarbon AC what does that mean? it claims to be 920 watts for 13K BTU

  8. #8
    Join Date
    Feb 2019
    Posts
    8
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    The first major difference between high velocity and other types of cooling is how they work. All air conditioners are considered “forced air” units, but the different types rely on certain methods of air circulation.

    Conventional AC systems rely on the method of diffusion, where cool air enters a room through a vent (supply vent), then is drawn back out through another vent (intake vent). Naturally, hot air rises and cold air sinks so the circulation in the room depends greatly on the placement of the supply and intake vents.

    High-velocity AC systems rely on the aspiration method, where the air is delivered with such speed that it creates air currents which circulate the cooled air throughout the room. In addition to creating better circulation, high-velocity air conditioning systems do a great job of reducing humidity.

    Ducting
    air conditioning systemsWith all central air conditioning, ducts are needed to carry the cool air throughout the building. However, certain properties are restricted when it comes to the type of ducting will fit with the architecture.

    Conventional AC systems require metal ductwork that averages about 6″ in diameter. This ductwork runs in two branches for the supply and intake of cool air. All of this ducting does require a significant amount of space. In many cases, some construction is needed to fit the building.

    High-velocity AC systems use smaller, insulated aluminum tubes for ducting. These tubes are flexible and average about 2″ in diameter. Because of the size, these tubes are generally easier to fit into existing walls, floor joists, etc. Many older homes are better candidates for high-velocity AC.

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