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Type: Posts; User: swendler

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  1. Replies
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    I do have all that. I had four load calcs done,...

    I do have all that. I had four load calcs done, but only saw the numbers for two, plus one I did myself via HVAC-Calc (maybe I don't trust that one, but at least it helped me understand the process...
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    EDIT - Okay, I misread your comment so I edited...

    EDIT - Okay, I misread your comment so I edited this down. You're saying that in heating mode I would have more start/stops, and that I'd lose some efficiency during the heating season that would...
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    Which combo makes more sense?

    For Dallas area, which combination makes more sense? Both qualify for tax credit. Ducts are currently sized for ~1500-1600 CFM.

    1) 4 ton 24APA748, 4 ton CNPHP4821 coil, 58CVA090 furnace, Infinity...
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    Higher SEER or matched coils?

    I don't need a NATE certification to tell that a higher SEER and EER is more efficient, but I'm sure that's not the end-all for picking a system.

    The combination I'm looking at is the 4 ton...
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    I kinda touched on this equipment before, but I...

    I kinda touched on this equipment before, but I am interested in hearing opinions on the following tradeoffs.

    I think I'll be going with the 4 ton 24APA7, but which matchup is better advised?
    ...
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    Dealer accolades

    When I compare dealers that meet all my criteria I could gather during the home visit, I look at other factors like the number of accolades given out by the manufacturer.

    In particular, I'm...
  7. Alright, so if I look at total cooling, 3 tons...

    Alright, so if I look at total cooling, 3 tons makes sense. Let me relay what I've been given as the contractor's argument for going with 4 tons.

    His analysis is based on sensible cooling,...
  8. This is helpful, as it seems your situation may...

    This is helpful, as it seems your situation may be comparable to mine.

    Yeah, after getting into this I'm becoming more and more astounded that I had an 8 ton system. I've been also told that...
  9. I'm in a Dallas suburb. Total house is ~3200, but...

    I'm in a Dallas suburb. Total house is ~3200, but downstairs is only ~1900, which is what the failed unit cools. (I have a second 3 ton for upstairs.) I typically run 75 in summer and 70 in winter,...
  10. As an engineer, sometimes my explanations use too...

    As an engineer, sometimes my explanations use too many words and my questions get lost in the middle. I apologize if I seemed to be second-guessing, but it appeared that some of the original answers...
  11. Well, let me make one thing clear. When I talk...

    Well, let me make one thing clear. When I talk about oversizing, I mean with respect to my peak load - not to my ducts. That is, I believe the house will support adequate ventilation for up to 4...
  12. Better to error a little big than a little small?

    I had a 5 ton downstairs unit that burned out. I've had five contractors give quotes so far, and am still waiting on one. The one thing that most everyone seems to agree on is that the 5 ton was...
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    Searching on the 58CVA090 furnace, the biggest...

    Searching on the 58CVA090 furnace, the biggest Infinity 21 system I can find that qualifies is a 3 ton (although they qualify very easily). What am I missing?

    I did see an Infinity 21 4 ton that...
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    Yep. I was combing through the AHRI site tonight...

    Yep. I was combing through the AHRI site tonight and discovered that Carrier's units list the 5 ton for efficiency quite a bit.

    What is the hit to go to the MVC furnace? It looks like that's a...
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    Umm...yeah. That's what's entering the plenum....

    Umm...yeah. That's what's entering the plenum. Two are vented through a 14"x25" grill. I believe the other is either the same, or a 20"x20", One guy thought the return duct sizing was okay there....
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    UPDATE: Well, I had two contractors out this...

    UPDATE: Well, I had two contractors out this week. Both were recommended to me by reputable sources.

    Both noted that my duct sizing was below par, on the order of 3.5 to 4 tons, versus my unit...
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    The system was originally spec'd as a 3.5 ton...

    The system was originally spec'd as a 3.5 ton downstairs and a 3 ton upstairs. However, we made some major changes to the floor plan. The most significant was that we converted a great room with 19...
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    Help with sizing?

    I have a dual unit setup for my home, which is 3200 sq ft, ~2000 down, ~1200 up. The downstairs unit failed a couple of weeks ago. The downstairs is 10' throughout, except the entryway which is 19'...
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