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  1. #1
    Join Date
    Jun 2005
    Location
    Homeowner
    Posts
    3
    Hi-first...I am a newbie, so if some of my questions/terminology don't sound correct, please take my apologies in advance.

    I received a quotation to add central AC (Carrier) to my hydro-air system. I have 2 zones, 2 air handlers and a weil maclean boiler.

    The house is quite old (1796), but has had updated electrical (200 amps), new boiler last september, hydro-air handlers are less than 10 years old. Footage is about 1,850 sq. ft. Area is north shore boston, ma. Chiller lines already run up to the second air handler in the attic. it would seem like a really, really easy install to me...

    My quote seemed high. Do I really need 2 compressors for a 2 zone hydro-air system to work? I don't want to reveal quote price because I would like to get some blind ranges on the price...

    any thoughts? or flames?

  2. #2
    Join Date
    Jun 2005
    Location
    Homeowner
    Posts
    3
    I just realied you pros on the forum can't talk price. Sorry...

    How about the need for 2 compressors with the system I described?

    Please ignore my questions about price...

    Thanks.

  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,046
    You could do the upstairs first and since cool air falls, it would help considerably on the 1st floor.

  4. #4
    Join Date
    Jun 2005
    Location
    Homeowner
    Posts
    3
    I could consider that...

    I have read much about compressors with multiple speed settings/zones. I just wondered if there was a reason he didn't offer that option because of the 2 air handler hydro -air setup.

    I guess I am just trying to educate myself. It's easier here than in front of him...

    [Edited by nriver1 on 06-10-2005 at 03:28 PM]

  5. #5
    Join Date
    Feb 2003
    Posts
    1,996
    It's still one compressor to one coil. You have 2 seperate AH so you need 2 seperate coils. This is still the best kind of zoning you can do. Make sure he calcs the AC load properly. I would be suspicious if the the units were the same tonnage. Avg size home in Boston shouldn't need more then around 3 tons total. If they recommend more check with another contractor.

  6. #6
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Be sure the existing setup,blower and ducts can handle the addition of a wet coil (resistance)for cooling.


    If you can post the air handler model ,someone may be able to post the fan data ,for it.

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