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  1. Replies
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    As Twilli say... Amazing how some systems run:D

    As Twilli say... Amazing how some systems run:D
  2. Replies
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    10x8 supply, 14x8 return closed off to addition. ...

    10x8 supply, 14x8 return closed off to addition. 14x8 supply, 20x8 return open to existing house. 2.5 ton outdoor unit, not sure of cfm setting. The blower seems a little louder than I expected...
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    Thanks. Will try to use sparingly, if at all,...

    Thanks. Will try to use sparingly, if at all, until remaining ducts can be opened up, hopefully about three weeks. We've never had a/c other than window unit so we should be able to survive a...
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    Will this hurt anything?

    My contractor just completed installing my new system. Trane XV95, XB13, T803, and all new ductwork. Part of the system serves a new addition (780sft). The addition is not yet insulated and...
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    The crawlspace is new, under the addition, 4...

    The crawlspace is new, under the addition, 4 block w/ 2" polyisocyanurate. I have included this space in my calcs, approximately 3,400 BTU loss. There is no infiltration loss component for the...
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    @ -10 loss is 51,200 @ -13 loss goes to 53,100 ...

    @ -10 loss is 51,200
    @ -13 loss goes to 53,100

    ach of 0.7 (avg)

    @ ach of 1.0 (poor) it goes to 60,000.

    The contractor used wrightsoft and losses ranged from 22-40 btu/sft/hr depending on...
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    Load calc question

    Existing 1040 sft ranch over full basement in northern lower Michigan with a 12yr old 78% Lennox 48k BTU gas furnace. The existing system has worked fine for the 10 years Iíve been here. Itís never...
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