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  1. Our climate here is very dry, so humidity is not...

    Our climate here is very dry, so humidity is not an issue. In fact it only gets hot when we get the hot Santa Ana desert winds, along with which comes 10% humidity.

    Sounds like the worst case...
  2. So if I happen to be gone during the two hours...

    So if I happen to be gone during the two hours they shut off the condenser, the HVAC will be running (probably on 2nd stage) the whole time, using up energy without doing any cooling? I guess that...
  3. Sure, here you go:...

    Sure, here you go:...
  4. Got it - it'll continue to circulate air...

    Got it - it'll continue to circulate air throughout the house, it just won't be conditioned - right?



    Yes, makes sense - will have to see how this plays out in actual usage.
  5. So the HVAC system will know to shut off after...

    So the HVAC system will know to shut off after the condenser has been cut off?
  6. Hmmm, this is exactly what I am worrying about -...

    Hmmm, this is exactly what I am worrying about - what happens to the "system" if the power to the condenser gets cut off. Doesn't the system somehow know when the condenser has been shut off (low...
  7. Yes, this is in line with what our provider (SCE)...

    Yes, this is in line with what our provider (SCE) reserves the right to do - up to 6 hours of "off" time per day. In the past year they have never exceeded 4 hours at a time, and all but that one...
  8. Thanks for the quick response! From what I read...

    Thanks for the quick response! From what I read on their website, when they shut the AC off, it's usually for about 2 hours - so that should alleviate any concern about damage?

    Regarding whether...
  9. Any risk from power company cycling my condenser on and off?

    I am considering signing up for my power company's rewards program, which allows them to turn off my AC remotely whenever they have a high load on their system, in exchange for crediting me $200 a...
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    Got it, so that means RH of < 60% for 75F...

    Got it, so that means RH of < 60% for 75F outside... Today the RH here is 9% :).
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    Thanks beenthere. I haven't considered the extra...

    Thanks beenthere. I haven't considered the extra dirt loading on the filter and coil, that pretty much puts an end to this idea!
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    True, good point. But if I could (which I can't)...

    True, good point. But if I could (which I can't) supply the cooler outside air right to the return, wouldn't that be better than recirculating and cooling the 80F air that is in the house?

    It...
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    I guess I look at it analogous to a car (maybe...

    I guess I look at it analogous to a car (maybe it's flawed). They say if you get into a hot car that's been sitting in the sun, to first run the AC with the windows open, to "push out" all the...
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    Thanks shophound! My original question was not...

    Thanks shophound!

    My original question was not so much "use the AC or a wholehouse fan?", because the latter takes too long.

    What I wanted to confirm was that under the conditions I listed...
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    Thanks guys, this all makes sense. Regarding...

    Thanks guys, this all makes sense. Regarding running a mechanical fan, yes, I know it is more efficient. But it's a large house, and when it heats up to 80F, it takes like three of four hours to...
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    Run AC with windows open?

    If it's 80F in the house when I come home from work, and 75F outside and low humidity (around 20%), is there a pro or con to keeping the windows open while I run the AC to cool the house off?
    ...
  17. Bad, bad, Key1, generating his own data... But...

    Bad, bad, Key1, generating his own data... But please do share it :).
  18. Ah, OK, I see what you are getting at. The key...

    Ah, OK, I see what you are getting at. The key (no pun intended) word here is primary - so you are saying that Key was trying to find the primary source of restriction, or conversely, to show that...
  19. I think I see what you are getting at, and if so,...

    I think I see what you are getting at, and if so, then we are not disagreeing (I don't think :) ). All I was trying to say was that if you increased your return area, you would reduce your total...
  20. Ha, I am not so sure - I think you take the...

    Ha, I am not so sure - I think you take the "obsession" prize :).



    Hmmm, I don't understand - when you simulated adding more return, your system static dropped from 0.98 to about 0.78 - isn't...
  21. Key, you and I seem to have the same obsession...

    Key, you and I seem to have the same obsession (some might say we are pathetic :) ), but to answer your direct question above, my thoughts are that your test results do not confirm that your system...
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    Thanks Dash, that would explain it. My Manual D...

    Thanks Dash, that would explain it. My Manual D is a few years old.

    You wouldn't happen to have a current flex duct friction loss chart handy, would you? :). I'd like to update the equations in...
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    Manual D and Flex Duct

    I am finishing up my efforts to "model" my existing duct system, using values from Manual D, as a precursor to trying to find the most effective changes to make in order to reduce my static.

    My...
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    0.22" static in the return duct (without a...

    0.22" static in the return duct (without a filter) seems like a lot of resistance. I also have a high static system (about 0.9"), of which 0.25" is in the return with the filter. It drops to 0.15"...
  25. Dan, I didn't see your e-mail address in the...

    Dan,

    I didn't see your e-mail address in the profile, but I posted my e-mail in a message to you, so if you get a chance, send it over! I spent a couple of hours last night setting up the basic...
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