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  1. you're preachin' to the choir. There are other...

    you're preachin' to the choir. There are other reasons, occasionally, for going with 2-stage.

    I spoke to both Trane and an AmStd distributor this morning and the XR16/Heritage 16, neither of which...
  2. Are you referring to the Platinum XM? According...

    Are you referring to the Platinum XM? According to AmStd website, the only heat pump in its line that has AccuLink is the ZM (XL20i). Best I can tell, the XM is identical to the XR17 (4TWR7)
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    Sorry to drag up an old thread, but I recall...

    Sorry to drag up an old thread, but I recall hearing this too, but the XL16i is still listed on Trane's website (along with some new "i" models that were introduced since your post). Was the 16i...
  4. American Standard Heritage 16 vs. Platinum XM

    I'm a mechanical designer. I'm specifying American Standard two-stage 3-ton heat pumps on two projects this week. I'm much more familiar with Trane's lineup.

    One of the mechanical contractors...
  5. Thanks for the tip. If you've used these, perhaps...

    Thanks for the tip. If you've used these, perhaps you can clarify. According the a troubleshooting guide I just read (http://www.totaline.com/dl/troubleshooting_signature_star.pdf), the contact...
  6. remote control feature on W-R stat (terminates vacation mode)

    I love my White Rodgers 1F95 thermostat. It has an interesting remote control feature. There's a terminal on the base that can be used to drop the thermostat out of Vacation or Hold mode....
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    Sorry for the delay... For some reason I'm not...

    Sorry for the delay... For some reason I'm not getting notifications when HVAC-Talk threads I'm subscribed to get updated.

    Regarding radiant barriers, these are cost effective in new...
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    Ted, I understand the physics (I wasn't trying to...

    Ted, I understand the physics (I wasn't trying to teach a building science course here), but in any case, a single un-zoned system in a two story home is still going to have problems maintaining...
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    As long as you're using the fan INSTEAD of your...

    As long as you're using the fan INSTEAD of your A/C, or to delay turning on the A/C, then this strategy will save energy and help address the upstairs comfort issues. But ventilating a house when the...
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    Anyone who's even casually studied building...

    Anyone who's even casually studied building science knows that powered ventilators are bad news.

    http://www.homeenergy.org/archive/hem.dis.anl.gov/eehem/95/951103.html
    http://tinyurl.com/m7nrq...
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    It's not the sloped ceiling I was concerned...

    It's not the sloped ceiling I was concerned about. It's knee-walls with attic space behind the wall (clipped ceilings are simply an indication of knee-walls). Doesn't sound like that's an issue.Most...
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    Powered attic vents are BAD BAD BAD. If there are...

    Powered attic vents are BAD BAD BAD. If there are leaks in the ceiling (anyone experienced using a blower door knows that's a safe bet), the fan will pull a slight negative pressure in the house,...
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    I should have emphasized that moving an AC to the...

    I should have emphasized that moving an AC to the north side would not be worth the cost. Even if the difference in the entering air temperature is 10 degrees, the capacity will only increase by 3 or...
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    When the sun hits the walls of the house, they...

    When the sun hits the walls of the house, they get quite hot. The radiation from the sun AND walls heats up the air surrounding the condenser. The effect is greater if the walls are light colored.
    ...
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    dousterhout, the reason I thought you had a heat...

    dousterhout, the reason I thought you had a heat pump is because you said that in your OP. Do you have a HP that only operates in cooling mode???

    You said your summer temps get over 100. I don't...
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    I agree with Ted and others, fix the house....

    I agree with Ted and others, fix the house. Moving the unit isn't going to solve the sort of problems you described. There are likely much bigger fish to be addressed.

    That being said, in new...
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    ...also known as heat strips. These are typically...

    ...also known as heat strips. These are typically coils of nichrome wire, similar to the elements in an electric hair drier. They provide supplemental heat when the heat pump is in defrost mode, and...
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    If the outdoor temperature reaches about 60F,...

    If the outdoor temperature reaches about 60F, then he can block the condenser intake vents and charge the system in cooling mode. Just make sure he's measuring superheat and not just the refrigerant...
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    Nothing is certain without checking it myself,...

    Nothing is certain without checking it myself, but this, plus what you said earlier about house dropping to mid-to-low 50's, suggests your heat pump is limping, or perhaps not producing any heat, and...
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    oh, forgot to mention, as noted by Tech23, the...

    oh, forgot to mention, as noted by Tech23, the tax credit expires in 3 weeks :-(
    Congress is considering a bill that would extend, but don't count on it. Act now.


    Based on your report that the...
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    I'll be the contrarian and suggest a 15 SEER...

    I'll be the contrarian and suggest a 15 SEER single-stage heat pump (typically 14 SEER with X13 blower will get you to 15). I like the Lennox XP14 + CBX27.

    You can get 30% tax credit for 15 SEER...
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    SE Arizona (~4,300 MSL) 2600 SF 69/77 day,...

    SE Arizona (~4,300 MSL)
    2600 SF
    69/77 day, 65/73 overnight
    all electric, 15 SEER heat pump w/X13 blower motor
    no fireplace or woodstove
    base load 420 kwh/mo avg
    dhw 90 kwh/mo avg
    cool 1850...
  23. Not sure what you mean by 'work with medium to...

    Not sure what you mean by 'work with medium to small hvac companies'. Are you talking about a scenario where you will be hiring the hvac subcontractors and include hvac retrofits as a part of your...
  24. I'm the author of the referenced paper and just...

    I'm the author of the referenced paper and just happened across this thread. I have participated in the Pro Technical forum here in years past, but not as much as I would like.

    The paper Elephant...
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    All of that is true. BUT, there are many many...

    All of that is true. BUT, there are many many homes in Miami that predate the heat pump. A friend of mine told me he still has trouble getting some of these old farts to convert to HP when the...
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