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  1. Loud popping sound on outdoor unit when AC turns on.

    I have recently noticed a loud popping sound coming from the outside unit (condensor + compressor) when the AC unit kicks on. I have not spent any time isolating or diagnosing further, but am...
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    Forced air fan (??)

    I have a 5 ton Trane serving approximately 2500 sq. ft. The most difficult room to cool is fairly far from the plenum and has vaulted ceilings. One HVAC contractor recommended either
    1 -...
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    My mistake. That is what I did get last time. ...

    My mistake. That is what I did get last time. The MERV 10 and MERV 11 ones can be found for less than that. I think I will be safe, rather than sorry and shell out the extra couple of Hamiltons :)...
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    Filter replacement insight, please

    I have two 5-ton Trane HVAC units, each of which is equipped with a filter adjacent to the fan (it appears). The OEM filters are 21" MERV 8 pleated filters (BAYFTFR21M). Each time I search for...
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    Sorry for approaching the DIY limit -- I...

    Sorry for approaching the DIY limit -- I certainly will NOT do it myself, as I want a strong tech to do it for me.

    Thanks SOOOOO much for all the insights!
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    What are signs that the evaporator is failing? ...

    What are signs that the evaporator is failing? Would I not be able to cool at all? The reason I ask is that I do not want to be snowed by a tech.

    Also - what/where is the proper forum to inquire...
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    Thanks - not wanting to get a plumber involved,...

    Thanks - not wanting to get a plumber involved, what should I expect to hear from the tech when he tries to clear the drain? I tried to snake it a while back and could only get so far before I...
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    RDP - thanks for the quick feedback. Can you (or...

    RDP - thanks for the quick feedback. Can you (or anyone else, for that matter) explain if the 42F temp is meaningful and quickly explain why the condensation in the 2ndary pan is meaningful?
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    Condensation seems to be filling up pan...

    I have had troubles with condensation from the evaporator making its way into the overflow pan. The overflow switch on the pan has not tripped, but the overflow on the drain line has a couple of...
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    A previous tech (a couple of years ago) must have...

    A previous tech (a couple of years ago) must have removed the caps, as I found them on top of the units. I put the caps back in place. Totally makes sense how the caps are required to aid...
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    Thanks for all the replies. I will look at some...

    Thanks for all the replies. I will look at some of these tomorrow.

    I have gas heat.
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    Thanks for the reply. I poured a bit of clorox...

    Thanks for the reply. I poured a bit of clorox down the drain portion, as is annually recommended. At this point, all appears to be OK. I have a plumber's snake, but apparently am not very adept...
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    2600 up 2600 down Yes, it's huge, but we got...

    2600 up
    2600 down

    Yes, it's huge, but we got a fantastic deal on the house a few years back and we have enough children to fill it...
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    Evap? producing too much water?!

    Last time I asked a question here, it was for my downstairs unit. Now, my upstairs unit is causing me grief.

    The unit shuts itself off automatically because of the overflow detector found...
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    skwsproul, thanks for the comments. I view the...

    skwsproul, thanks for the comments. I view the first AC tech from three perspectives: 1 - he was totally incompetent, 2 - he was mildly incompetent and knew only 1 solution, regardless of the...
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    That is what he said he would do. Thanks.

    That is what he said he would do. Thanks.
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    Had another tech visit this morning. The unit...

    Had another tech visit this morning. The unit started right up when he started his investigation. I then explained the series of events that preceded his visit: melted wire nut, replaced wire nut,...
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    Again - thanks for the insights! I will report...

    Again - thanks for the insights! I will report back w/ what happens tomorrow. I am truly grateful for all the help.
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    I have visually confirmed (via internet photo)...

    I have visually confirmed (via internet photo) that what he used to get the condenser started was a hard start. He used it to measure the current at startup - but removed it and proceeded to tell me...
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    cmajerus, Thanks -- I have another tech...

    cmajerus,
    Thanks -- I have another tech (different company) coming by tomorrow. I will ask about the cap. In retrospect, today's tech seemed more inclined to sell me something than to identify and...
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    beenthere -- that makes sense. Thanks a lot. ...

    beenthere -- that makes sense. Thanks a lot.

    Based on replies here, I am getting more and more indication that today's contractor is sub-par, as that fact should have definitely crossed his mind.
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    Thanks - why would the indoor replacement be...

    Thanks - why would the indoor replacement be required?

    Also, will a mismatched indoor unit (12 SEER evap, etc.) and outdoor unit (13 SEER) be problematic?
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    Model is Trane XR12 and it is a 5-yr unit, as I...

    Model is Trane XR12 and it is a 5-yr unit, as I confirmed it with the original installer.

    Todays' tech did have the right tools and was able to get the condenser to fire up, but noted that the...
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    As luck would have it, the install date was Feb...

    As luck would have it, the install date was Feb 2003. I have a better tech [from same place as yesterday] coming today (should be here in 10 mins) and I have another scheduled for tomorrow AM, in...
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    I bought the house in 2006 and the records were...

    I bought the house in 2006 and the records were not passed along to me. There is install information on the units (in the attic) and I can call the original installer (who has been acquired by a...
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