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  1. #1
    Join Date
    Feb 2009
    Posts
    131

    650sq ft needs ac!

    My father in law just purchased a metal building on concrete slab. part of the metal building is setup for an office/living quarters. It has average insulation package with sheetrock walls and single pain windows. the previous owner just had a window unit in each room.

    I know when i get time and do the manual J on this, it will most likely not call for a 2 ton system and will only call for probably 4-5 supply ducts MAX. (two rooms and one bathroom and one closet) he was wanting to install a normal horizontal unit in the attic space above the living quarters with the ducts dropping down into the ceiling. what would you suggest to use if it tells me less than 2 tons.

  2. #2
    Join Date
    Mar 2009
    Posts
    32
    Less than 2 tons. like a 1.5 ton. Or put in a dual speed 2 ton.

  3. #3
    Join Date
    Feb 2009
    Posts
    131
    we only deal with 2.0 ton - 5.0 ton. I was not aware that there was a complete 1.5 ton system. any brands u can suggest?

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,594
    York has a 1 ton.
    Contractor locator map

    How-to-apply-for-Professional

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

  5. #5
    Join Date
    Oct 2008
    Location
    Rochester, N.Y
    Posts
    20
    Use a Mr. Slim with heat pump

  6. #6
    Join Date
    Feb 2009
    Posts
    131
    i will look into both of those. thanks guys.

  7. #7
    Join Date
    Oct 2008
    Location
    Rochester, N.Y
    Posts
    20
    here is a link for Mr.Slim I have put alot of these in they work great. you might have to copy and paste i was having trouble on Mr. Slims site.

    http://www.mrslim.com/products/itemD...ProductID=1492

  8. #8
    Join Date
    Feb 2009
    Posts
    131
    i also looked online some more and found rheem and goodman offering 1.5 ton condensing units. but what would i do about the coil and air handler? just set the AH to low speed?

  9. #9
    Join Date
    Sep 2006
    Location
    Shenadoah Valley
    Posts
    185
    rheem 1.5 ton hp with 1.5 ton varaiable speed air handler you are at 600 cfm you will be fine.
    WORK HARDER!!!!! millions on welfare depend on you...
    opinions are like bungholes everbody has one...

  10. #10
    Join Date
    Feb 2009
    Posts
    131
    is there no 1.5 ton straight cool? father in law was requesting electric heat.

  11. #11
    Join Date
    Feb 2009
    Posts
    131
    actually i just found rheem and goodman that are 1.5 cooling only.

  12. #12
    Join Date
    Sep 2007
    Location
    TX
    Posts
    209
    york latitude

  13. #13
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    5,025

    Do everything in the proper sequence

    Do everything in the proper prioritized sequence.

    First, do what you can to lower the heat-gain of the building, then do a heat gain calc & size the equipment accordingly.

    If going with a split-system, & it calls for a 1.5-Ton condenser, I would go with a 2-Ton evaporator with a TXV metering device.

    The amount of airflow through the E-Coil would depend on whether the conditions are humid or dry. If dry I'd go with up to 700-CFM through the coil. If very humid go as low as 350-CFM per ton or 525-CFM.

    It might call for one ton of cooling!
    Click name above for on-line info.
    Last edited by udarrell; 03-15-2009 at 12:11 PM. Reason: Might call for one ton of cooling

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