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10-21-2010 9:21 AM


  • Posted in thread: What BTU need to heating up 3000sf house on 04-10-2012 at 07:06 PM
    This is a situation that you need a professional evaluation - you need what the business
    referrs to as a Manual J heat gain-loss calculation. The furnace deals with the heating (heat
    loss) side, while...

  • Posted in thread: Goodman Indoor Unit Rusty Coils on 04-10-2012 at 06:49 PM
    If the coil gets blocked up every summer you might want to try a 4 to 1 mixture of lemon
    flovored clorox and water into the drain pan each summer. This will kill any residual mold in
    the pan and lines...

  • Posted in thread: A/C freezing up on 10-21-2010 at 08:21 AM
    You need to find out why the filters were wet in the first place. There is no reason for
    moisture getting into the return ductwork.There must be some air leakage in the return side for
    water to get in...

  • Posted in thread: HVAC - Coil Cleaning on 10-20-2010 at 06:29 PM
    Slove the problem first!Where is the dust comming from in the first place?A proper HVAC system
    is a closed system - air is pulled across the filter where it is cleaned, goes to the unit
    where it is he...

  • Posted in thread: HVAC design flaw? on 10-20-2010 at 06:02 PM
    An excellent rule of thumb for return sizing is filter length x filter width x 2 = capacity, so
    20 x 25 x 2 = 1000 cfm and 18 x 18 x 2 = 648. You have a nominal capacity of 1648 cfm and a 5
    ton unit n...

  • Posted in thread: A/C freezing up on 10-20-2010 at 05:44 PM
    Just because you charged and old unit in spring does not mean it is still charged properly.Does
    the air velocity still feel the same?

  • Posted in thread: Insulation in cold air return? on 10-20-2010 at 05:33 PM
    if this is loose insulation in an unlined return, the return suction pressure has pulled the
    insulation in from the attic or walls. This means that your return trunk is not airtight and
    your efficienc...

  • Posted in thread: Re-routing furnace ducts in a old mobile home? on 10-20-2010 at 05:22 PM
    Assume that you have a 2 1/2 ton air handler that moves 1000 cfm of air.Now assume that you are
    loosing 20% (200 cfm) of this air under the house thru duct leakage. 1000 cfm is being sucked
    into retur...

  • Posted in thread: oil hot water problem on 10-20-2010 at 04:58 PM
    1) if oil filter gasket is not 100% tight air can get into the line and shut it down2) same for
    all oil piping connections3) cad cell could be getting weak4) dirty/blocked oil filter