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  1. Replies
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    This is my undersanding. Let's say the furnace...

    This is my undersanding. Let's say the furnace qualifies but the AC efficiency doesn't. Then if the furnace part of the installation doesn't add up to at least $5k, you technically wouldn't get the...
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    I could see an overshoot maybe if trying to step...

    I could see an overshoot maybe if trying to step from one temperature to another as fast as possible.

    But when recovering from a setback temperature, there's no rush and it could be very...
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    I thought I knew the stat pretty well. Guess...

    I thought I knew the stat pretty well. Guess not, cause I didn't even know about the 3 second feature with the right button (doh). Anyway, that's exactly what I was looking for, I'll be using that...
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    Fratello25, I hope you don't mind, but I'd like...

    Fratello25, I hope you don't mind, but I'd like to add another infinity stat question, about humidifier setpoint. Let me know if you want this moved to a new thread.

    The humidity level for...
  5. fullcircle, don't know if you're still...

    fullcircle, don't know if you're still considering the 58MVC, but if you are, I wouldn't worry at all about it being 3-stage modulating versus say 60-stage modulating or whatever Trane and others...
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    The zoning infinity stat will definitely work. ...

    The zoning infinity stat will definitely work. If you're certain you'll never want zoning, then either would be fine. If there's a chance you'll want zoning someday, then the zoning version could...
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    I would think that having air circulating when...

    I would think that having air circulating when the furnace has switched off should help reduce the difference in temperature between different areas or rooms (the opposite of what you're noticing). ...
  8. Not sure how much this matters, but with the...

    Not sure how much this matters, but with the Performance 16 the low stage is something like 78% capacity of the high stage. The Infinity 19 has a bigger difference between high and low (low is...
  9. Responding as a home owner, not a pro, but had...

    Responding as a home owner, not a pro, but had looked into similar question before. The Infinity model is a bit more efficient than the Performance model (25HPA636 is the Performance 2-stage heat...
  10. New question. What's your opinion of the Carrier...

    New question. What's your opinion of the Carrier 4" media filter cabinet that comes as part of the Carrier furnace?

    For me, a 4" media filter is exactly what I wanted. But it doesn't seem like...
  11. Thanks for the replies. I'll see if I can get...

    Thanks for the replies. I'll see if I can get the size of the drop increased some, and will keep an eye on the dryer vent for a while before deciding whether or not to move it.
  12. couple of installation questions for furnace and AC

    Couple of installation questions for furnace and AC.

    (1) AC too close to dryer vent? For the outdoor unit, how close can it be located to a clothes dryer vent, to avoid any issues with lint...
  13. I'm being told that the Performance series...

    I'm being told that the Performance series definitely has the Infinity communicating features (I think it is even in their brochures). Whether or not the Infinity unit has a few extra communicating...
  14. I'll know my situation better once the new system...

    I'll know my situation better once the new system goes in I think. Trunk lines are decent I believe, but have some pretty long branches that are not so good.

    Do you know if an Infinity stat...
  15. Thanks wormy. I probably didn't pick the right...

    Thanks wormy. I probably didn't pick the right thread to ask my question, about airflow for low-stage (can low-stage cfm be so low that it doesn't circulate well through the rooms for cooling, if no...
  16. Again, a non-pro, but to me something doesn't...

    Again, a non-pro, but to me something doesn't seem to add up.

    I know square footage can't be used for sizing the compressor. But just in terms of airflow, it seems kind of surprising to me that...
  17. Your comment about more airflow is interesting. ...

    Your comment about more airflow is interesting. I was just asking a question about that in another thread, because I'm concerned about it.

    If the Infinity has an even lower low-stage than the...
  18. Also wondering if Infinity is worth the extra $. ...

    Also wondering if Infinity is worth the extra $. From what I can see, the biggest differences are

    (a) the Infinity has a larger difference between low-stage capacity and high-stage capacity,...
  19. Are there ever situations where the lower cfm at...

    Are there ever situations where the lower cfm at low-stage doesn't provide enough air velocity at the floor vents or enough ventilation to make the room comfortable? (even if return air is high on...
  20. Thread: Bryant vs Trane

    by clyde1
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    I think you were referring to the Bryant...

    I think you were referring to the Bryant 187BNA036.

    Do you not like that particular A/C model in general, or just for this application? Looks like this is about the same as Carrier's Performance...
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    Peace ga-hvac-tech. Hope sometime when I have a...

    Peace ga-hvac-tech. Hope sometime when I have a question you know the answer to, you don't hold back from helping me out.

    Well, I can tell you what I was thinking. It's not always safe to...
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    Is this a trick question, or are you making fun...

    Is this a trick question, or are you making fun of us? :toetap:

    Are you feeding the dog or a human?
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    ga-hvac-tech, I don't want to match wits or argue...

    ga-hvac-tech, I don't want to match wits or argue about it bro (or clutter up this thread anymore than I already have). And you may be right, but hear me out to see if this makes sense.

    I think...
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    This forum has been great for me. Went from...

    This forum has been great for me. Went from knowing nothing to knowing enough to be dangerous, and just find it to be very interesting stuff. Can tell the pros on here know more real-world...
  25. Seems like for most furnace brands, for a given...

    Seems like for most furnace brands, for a given heating capacity model, there is a choice of at least two different blower capacities.

    But with the Trane xc95m, you can't get a 4-ton blower with...
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    In general, how important is it to use a...

    In general, how important is it to use a contractor that is both bonded and insured? Or what if insured but not bonded?

    If you think the contractor knows what they're doing based on your...
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    Just a bump on some previous questions that I'd...

    Just a bump on some previous questions that I'd still like to get an answer to if possible.



    Also had a question on Luxaire or any system with 2-stage AC without communicating stat, with...
  28. I think I read that the Infinity 19 HP has a low...

    I think I read that the Infinity 19 HP has a low stage that is 68%, instead of 80% like the Performance 2-stage? Is it always better to have the wider difference between low and high? Is 68% vs...
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    I've been scoping out Luxaire some, and it does...

    I've been scoping out Luxaire some, and it does seem to be well liked by most people. When it comes to dehumidifying, since not communicating, if used with 2-stage AC, do you give up much compared...
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    ok, so we're sort of on the same page, and sort...

    ok, so we're sort of on the same page, and sort of not.

    Since this is is sarcastic Sunday (all in fun), for me once you get above say 12 stages, I care more about the color of the paint than...
  31. Replies
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    I don't think those analogies fit very well,...

    I don't think those analogies fit very well, because there is an immediate visual response.

    For heating, with all the mixing of air, modulating back and forth between two narrow stages is more...
  32. Replies
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    Why would you use the difference between 1 and 2...

    Why would you use the difference between 1 and 2 stage as an example to compare to 30 & 31? Who was trying to make that argument?

    I was comparing a 6-stage (3&4) to 60-stage (30&31). Or if...
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    commerce48, I know you're kind of waiting for the...

    commerce48, I know you're kind of waiting for the new Carrier stuff, but I think you mentioned that if not Carrier then probably York. Wondering why you would prefer York over Trane, since Trane...
  34. Replies
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    You would agree that there is a point of...

    You would agree that there is a point of diminishing returns? My gut feeling is that the difference in benefit from multiple stages is something like this, on a scale from 1 to 10, 10 being the...
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    Pretty big difference in my book. IMO it's...

    Pretty big difference in my book.

    IMO it's all about the manufacturer trying to snow the customer, because they don't have a product to market in time, or whatever. Baffle the customer with...
  36. Replies
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    IMO the term Modulation has already been ruined...

    IMO the term Modulation has already been ruined in this industry and shouldn't be used anymore due to lack of standard. Of course, it will be used forever.

    As a novice customer, things a salesman...
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    Ok, finally got it through my thick skull. ...

    Ok, finally got it through my thick skull. Maybe someday they'll fix that on the SLP, because it makes no sense to me.

    I may be wrong, but I thought the Rheem and York were not communicating,...
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    I'm still waiting for a Lennox expert to show...

    I'm still waiting for a Lennox expert to show you're mistaken about that, but it hasn't happened. Either you're correct, or people just don't know enough about how the SLP98 works yet, or the right...
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    Actually, this is where I read the analogy to...

    Actually, this is where I read the analogy to cruise control. Not exactly how I remembered it, especially Lennox. Oh well.


    --- Trane ---

    " The XC95m is like cruise control on the highway;...
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    You're right, I didn't get it, but I do now. I...

    You're right, I didn't get it, but I do now.

    I don't understand why a company would manufacture a fully modulating furnace that can't accept an actual temperature reading from the stat. Seems...
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    Exactly. It doesn't need to be blind. Since it...

    Exactly. It doesn't need to be blind. Since it can measure the temp, and know that it's getting close, it should slow down based on that, instead of having to worry too much about learning from...
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    For heating only, and zoning aside, I would think...

    For heating only, and zoning aside, I would think a fully modulating furnace paired with a stat that just provided the actual temperature, should only require a very simple slow-seeking algorithm to...
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    That's a 3.5 ton blower on the furnace isn't it? ...

    That's a 3.5 ton blower on the furnace isn't it? And from what I've been able to find, even the 5-ton blower is capable of being turned down very low (almost as low as the 3.5 ton is one of the...
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    Actually not true. Both installers seem fine,...

    Actually not true. Both installers seem fine, and I am close to pulling the trigger on the Carrier. Trying to get all of my questions out of the way now, cause once it's done there's no looking...
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    :):) Even if true, I can't imagine it would be...

    :):)

    Even if true, I can't imagine it would be a limitation of the hardware or that it wouldn't be corrected soon. Can furnaces get firmware updates? What about communicating stats, can they get...
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    In terms of holding a steady temperature in the...

    In terms of holding a steady temperature in the winter at various points within the house, is there really a perceptable difference between the 3-stage Infinity 95 furnace (with Infinity control)...
  47. So it sounds like it is a combination of torque...

    So it sounds like it is a combination of torque (or maybe current draw) and rpm that is used to determine the CFM ????

    And I think you're comfirming that the static pressure measurements (or...
  48. Thread: Spend my money!

    by clyde1
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    1,691

    If low stage is running at almost 80% of high...

    If low stage is running at almost 80% of high stage capacity, how much difference does it really make with the run time?

    In situations where low stage would run nearly continuously without...
  49. Do all newer furnaces with VS blower measure CFM...

    Do all newer furnaces with VS blower measure CFM by measuring the torque on the motor and knowing the rpm? Or is the static pressure measurement also part of what is used to measure CFM?

    As far...
  50. Thanks TB and zver1, letting it soak for a while....

    Thanks TB and zver1, letting it soak for a while.

    While comparing costs, the 2-stage option seems to be a lot less expensive than adding whole-house. But it concerns me that the low-stage is...
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