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Type: Posts; User: lgutkows

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  1. udarrell, lkapigian, and tedkidd, Thanks...

    udarrell, lkapigian, and tedkidd,

    Thanks tremendously for your replies. I can't believe how close I was to pulling the trigger on a 5 ton unit as recommended by my contractor.

    As it turns out,...
  2. 4 Ton replacing 5 Ton; will existing duct work be ok?

    If any of you have read my previous posts, here and here, I'm trying to have my existing HVAC replaced.

    I think I may finally be at the point of selecting a 4 Ton A/C unit based on load calcs (not...
  3. I'm gathering then, it all comes back to being...

    I'm gathering then, it all comes back to being properly sized and following the usage assumed by the heat calc method (e.g., Manual J). This all makes good sense. Thanks for everyone's input. If any...
  4. If it runs a little bit regularly during the day...

    If it runs a little bit regularly during the day or a lot continuously at night, isn't it kind of the same thing? I'm having to remove the same number of BTUs regardless. In one case, I'm doing it...
  5. There's no one home during the day. I live in San...

    There's no one home during the day. I live in San Diego where our 1% db is 88F with low humidity. I just assumed I'd save energy by not running it when no one is around. Maybe that's wrong?
  6. Effect of intermittent use on A/C sizing?

    OK, so we've all heard loud and clear that oversizing central A/C is a bad thing to do, and we should use proper load calculations like Manual J to avoid that. Does Manual J implicitly assume a usage...
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    Thanks jimj!!! That is a great article. It...

    Thanks jimj!!! That is a great article. It supports my concern that the load calc initially supplied isn't defensible. On the other hand, it gets me just a little concerned that it may be impossible...
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    Speaking of input data... I've got a question...

    Speaking of input data... I've got a question related to a sizing calc they used for window heat gain (excluding solar heat gain).

    For a design dry bulb temp of 90F and an interior cooling temp of...
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    You know, I was wondering if there were outfits...

    You know, I was wondering if there were outfits like that. How would I search for one in my area? After doing this analysis myself, I realized it is indeed a couple hour job (at least) if you want...
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    He actually didn't use software. Just a form with...

    He actually didn't use software. Just a form with blanks to write square footages of walls, windows, etc. and then heat factor multipliers based on design temp that are applied to square footages....
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    Thanks for your reply. I got my design temps from...

    Thanks for your reply. I got my design temps from the ACCA speed-sheet for Manual J abridged edition. I'm 10 miles inland from the coast and that can make a surprising difference. So I used the data...
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    Thanks for your reply. I will ask whether he's...

    Thanks for your reply. I will ask whether he's certified (or at least trained). He did give me the form, but it says nothing about what it is based on (e.g., Manaul J). This is a company that has...
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    Paralysis by Analysis (Load Calcs)

    Can't believe it but I just turned away the installer for our new HVAC system. I was reviewing the company's load calcs over the weekend, and it just didn't feel good. How do I get from here to...
  14. Yeah, I think that's where I'm heading....

    Yeah, I think that's where I'm heading. Appreciate your thoughts.
  15. Well it turns out this area may be accessible...

    Well it turns out this area may be accessible from the ceiling of a closet. I'm handy enough to open up the sheet rock and repair it when it's done, but I'm sure I'd be in for another 2-3 hours of...
  16. Yeah, I've read about the recommendation to use a...

    Yeah, I've read about the recommendation to use a new line set. I've read they have rifling inside and even though the r22 can be flushed, it's safer to go new. Now, that's what I read--don't know...
  17. No kidding! First time I've had a roof done, and...

    No kidding! First time I've had a roof done, and I live in San Diego where the need for A/C is not often. Didn't even dawn on me this could happen or to check. After the first year, I did call the...
  18. Leaking line set: can leak's sound vibrations travel through copper?

    Hi all,

    Low pressure line will not hold pressure during nitrogen tests. It leaks down immediately. A distinct hissing noise can be heard in the HVAC equipment closet when nitrogen valve is opened....
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