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  1. #14
    Join Date
    Mar 2009
    Mount Holly, NC
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    to answer your question, the difference may be in the numbers you vs the contractors used for the software. wall construction, duct leakage, window size/awnings etc all affect the load. shade, roof design, also the web numbers may not precisely relate to your design condition.
    The TRUE highest cost system is the system not installed properly...

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    Do you go to a boat repairman with a sinking boat, and tell him to put in a bigger motor when he tells you to fix the holes?

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  2. #15
    Join Date
    Mar 2012
    West Chester, PA
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    As far as efficiency loss from outside air goes, it is pretty minimal. If you view it as a concer, then you should have the nit installed single pipe so that you are pulling combustion air from the conditioned space. (you must have adequate free area to pull from)

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