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Type: Posts; User: wyounger

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  1. Replies
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    2,433

    That's a fair assessment. While I probably...

    That's a fair assessment. While I probably overstated it a little, my point was just that the way people talk sometimes, you'd think that it's a miracle that a Goodman ever works, and that Tranes...
  2. Replies
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    511

    What part of the country are we talking about? ...

    What part of the country are we talking about?

    Sounds pretty normal for a system in Florida, unless a real cold snap comes through.
  3. It varies from house to house. We can't really...

    It varies from house to house. We can't really tell you what the number will be. Typically it's between 25 and 40, but there are some exceptional cases.

    There's no harm in bumping it down a few...
  4. Replies
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    769

    My best answer is to put a fresh air intake in...

    My best answer is to put a fresh air intake in the laundry room and close the door when the dryer is running. It won't be very conditioned in the laundry room during those times, but that's a pretty...
  5. Replies
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    738

    When you say it comes in just under 5 tons, is...

    When you say it comes in just under 5 tons, is that from Manual J alone or did you also do Manual S for equipment selection? Manual J alone doesn't tell you what size equipment you need, it tells you...
  6. Replies
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    879

    From what I've seen there's not a great deal of...

    From what I've seen there's not a great deal of difference in restriction from one media filter brand to another. The main thing to make sure of is that you're giving it enough filter area to keep...
  7. Replies
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    1,397

    This is a more apples-to-apples comparison than...

    This is a more apples-to-apples comparison than we usually get to make!

    I like the spine fin design on Trane's outdoor coil and their choice of a defrost control that only defrosts when it...
  8. Replies
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    1,345

    Four and five ton systems have to move a lot of...

    Four and five ton systems have to move a lot of air to work properly. It's just the nature of them; they're the biggest equipment sizes used in residential, and the airflow they need is proportional...
  9. Replies
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    1,292

    Propane will eat you alive, though, trying to...

    Propane will eat you alive, though, trying to heat that much space in a cold climate. If you're going to have it around for a stove and/or fireplace, fine. But the cost of heating a place like that...
  10. Sounds like with the EMR feature on they intend...

    Sounds like with the EMR feature on they intend you to set up times and temperatures that are arrival times, not departure times.

    Earlier programmable thermostats were just glorified timers with...
  11. Thread: Humidifiers

    by wyounger
    Replies
    33
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    4,674

    Bypass humidifiers are often constrained by the...

    Bypass humidifiers are often constrained by the running time of the furnace, since they are basically only effective when hot air is flowing through the ducts. Modulating furnaces run at low fire...
  12. Replies
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    2,433

    The AC system did spring a leak a little early,...

    The AC system did spring a leak a little early, but 14 years is not an unusually short life for this kind of system. And yeah, you only had one repair on the furnace. And I'm not sure why you would...
  13. Replies
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    886

    Yup. There's probably an upper limit on how many...

    Yup. There's probably an upper limit on how many degrees beyond your cooling setpoint it will go, but that's the basic idea.
  14. Replies
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    1,770

    I love my Infinity, but must agree. That sounds...

    I love my Infinity, but must agree. That sounds like too much cooling for a well-insulated 2200 sq ft house, even in Dallas. And the furnace even more so.

    Infinity is good equipment, and...
  15. Replies
    11
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    886

    If it's too humid inside, the VisionPro will run...

    If it's too humid inside, the VisionPro will run the AC more than is required to get to your temperature setpoint ("overcooling").

    It's better than nothing, but it's not exactly elaborate.
  16. Replies
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    2,373

    Variable speed blowers can help if you leave them...

    Variable speed blowers can help if you leave them in the fan on mode- same as with regular ones, but you can usually select a lower speed and have it take less juice to keep the blower going. But...
  17. Replies
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    740

    Sorry. The OP wants to know what sort of furnace...

    Sorry. The OP wants to know what sort of furnace and AC to buy, what efficiency suits their house, but we don't know if they are in Minneapolis or Miami. We need to know where they are to know what...
  18. Replies
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    740

    Location... climate... utility rates? The...

    Location... climate... utility rates? The characteristics of the house matter but there is no one size fits all solution that works everywhere in the country.
  19. Replies
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    2,373

    A 25 degree differential is probably well in...

    A 25 degree differential is probably well in excess of the correct design conditions for your area. Outdoor summer design temp here in Atlanta is 94, and probably a little lower for any location in...
  20. Replies
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    2,373

    Well, it's good that they used Manual J. That's...

    Well, it's good that they used Manual J. That's the system we look for. It still sounds like a lot- so I'd agree with the questions on the windows. I'd also wonder what design temperatures they used....
  21. Replies
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    2,373

    Why a furnace at all upstairs? You're not going...

    Why a furnace at all upstairs? You're not going to use much backup on a second floor at all, and you can get more out of a heat pump by pairing it with electric backup. The reason being is that with...
  22. Replies
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    984

    I must have goofed my previous calculations. If I...

    I must have goofed my previous calculations. If I plug in an imaginary big (six ton) heat pump with COP the same as my current one and three times the output at each rating point (since mine is two...
  23. Replies
    9
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    984

    The aux heat (furnace in this case) will come on...

    The aux heat (furnace in this case) will come on every time the heat pump goes into a defrost cycle, regardless of outside temperature. During that time, it will show the indicator light on the...
  24. Replies
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    857

    Following the design specs to the letter means...

    Following the design specs to the letter means selecting the next-size-up furnace; in other words no more excess capacity than what comes from one step to the next, with no fudge factor. So with a...
  25. Thread: filter size

    by wyounger
    Replies
    12
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    1,002

    Goodman specs typically show double the filter...

    Goodman specs typically show double the filter area for disposable filters as for "permanent" filters. The only permanent filter I know of has a hard time even catching hair, though, so it's not very...
  26. Replies
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    1,602

    If they are both running on the 1500 watt setting...

    If they are both running on the 1500 watt setting at the same time on the same cord, it should pop the circuit breaker or fuse immediately. If not, the extension cord will overheat and catch fire...
  27. Replies
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    702

    Typically auxiliary/emergency heat comes on in...

    Typically auxiliary/emergency heat comes on in two or three stages on a sequencer (a fancy time delay relay). You may find that it's lukewarm for a few minutes, then warm for a few minutes, and if...
  28. Replies
    7
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    857

    Did the contractors who did the Manual J know...

    Did the contractors who did the Manual J know about the insulation going in?

    154k input * 80% = 123k out (and this is too big, you say)


    Potential choice:
    100k input * 94% = 94k out.
    This is...
  29. How much heat you can hold in with a window...

    How much heat you can hold in with a window treatment depends on the window treatment. Curtains work better than blinds. If you don't think curtains can act as insulators, you haven't been to a house...
  30. It might have been defrosting- it does...

    It might have been defrosting- it does intentionally stop the outdoor fan then (but keeps the compressor and indoor fan going). The defrost cycle should never last for more than about 10 minutes,...
  31. Replies
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    412

    None at all? I thought I remembered us having a...

    None at all? I thought I remembered us having a regular based out of Ontario (California) or thereabouts.
  32. Thread: filter sizing

    by wyounger
    Replies
    8
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    683

    It's loose in the sense of having old single-pane...

    It's loose in the sense of having old single-pane windows. I also have a hunch that the oldest of the exterior walls may be uninsulated. It's been added on to so many times over the years that you...
  33. Replies
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    1,644

    Ah. In that case, the other possibility that...

    Ah. In that case, the other possibility that comes to mind is that it takes a few days to learn how to best run your particular combination of house and furnace. It must be the modulating flavor of...
  34. Replies
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    7,084

    Note that the OP mentions that this is a...

    Note that the OP mentions that this is a second-floor system.

    In Atlanta, most second-floor systems need more cooling capacity than heating capacity. Essentially all forced air furnaces can move...
  35. Replies
    16
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    1,644

    Don't blame the furnace, blame the control system...

    Don't blame the furnace, blame the control system :)

    Modulating furnaces work best with modulating thermostats! Sounds like as configured your "modulating" furnace is having to act as a 2 (or...
  36. Replies
    1
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    1,492

    Anticipation is used to compensate for how some...

    Anticipation is used to compensate for how some systems deliver heat with a lag factor. This isn't usually a big problem with forced air systems, unless they are severely oversized, but can be an...
  37. Thread: filter sizing

    by wyounger
    Replies
    8
    Views
    683

    Nice PDF, beenthere. Makes a good reference, at...

    Nice PDF, beenthere. Makes a good reference, at least when you're targeting 300 fpm.

    I agree that there could be lots of other problems, but clearly one is the return; the filters need to be...
  38. Replies
    13
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    1,683

    Airflow isn't the only question here. Even...

    Airflow isn't the only question here.

    Even with a modulating furnace, having lots of excess capacity is not a good thing. They can only modulate down to 40% of their rated *burner* capacity; below...
  39. Replies
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    708

    Even at peak rates the heat pump's heat is...

    Even at peak rates the heat pump's heat is probably reasonably economical. But you wouldn't want to run the strips along with the heat pump during peak time.

    Your installer can probably put the...
  40. Replies
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    412

    I'm on the hunt for somebody to improve the...

    I'm on the hunt for somebody to improve the cooling efficiency of an existing 5 ton residential system in San Bernardino, CA- primarily to improve airflow to a level that suits a desert application...
  41. Thread: filter sizing

    by wyounger
    Replies
    8
    Views
    683

    The Patient: Mom's house in San Bernardino, CA...

    The Patient:
    Mom's house in San Bernardino, CA
    Old, loose house, hot-dry climate

    Four year old gas-electric HVAC. Condenser is a Goodman CLT60. Furnace is horizontal, attic, 80%, and was done at...
  42. Thread: Thermidistat

    by wyounger
    Replies
    15
    Views
    1,438

    My BS detector is beeping quite loudly. The sad...

    My BS detector is beeping quite loudly. The sad part is that they may actually believe what they're saying. A little common sense makes it clear that the furnace control board can't do the best job...
  43. Replies
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    830

    The Rheem/Ruud modulating furnace is fully...

    The Rheem/Ruud modulating furnace is fully modulating. You have to use a special thermostat with it, though. If you use something simple, then it does act as a three-stage.

    The York unit is new...
  44. Replies
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    2,493

    It's easy to calculate the economic balance point...

    It's easy to calculate the economic balance point here in Atlanta.

    You take our electric rates, the efficiency of heat pumps in this climate, and the cost of natural gas, and oops... I don't have...
  45. Replies
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    1,718

    If I were starting from scratch in Seattle, I...

    If I were starting from scratch in Seattle, I would use an all-electric heat pump and not bother with the gas. Heat pumps don't need a great deal of backup heat in mild climates like yours, and your...
  46. propane

    OK, I am arriving to this party way late... busy lately, sorry.

    I did want to chime in with one detail that seemed to get forgotten in the operating cost calculations.

    You said your propane was...
  47. Thread: Bryant Hybrid

    by wyounger
    Replies
    4
    Views
    665

    I suggest (and this is essentially what I have...

    I suggest (and this is essentially what I have myself) the Evolution two-stage variable furnace and Evolution control with not-necessarily the fanciest Evolution-type heat pump. You can use nice (but...
  48. Replies
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    4,133

    I'm not familiar with how the 1277 handles dual...

    I'm not familiar with how the 1277 handles dual fuel yet, but here's what I'll say in general.

    Actual balance point varies depending on the heat loss of the house, the capacity of the equipment,...
  49. Replies
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    5,892

    A house that needs FOUR central air systems? ...

    A house that needs FOUR central air systems?

    With that many systems you may want to consider a single smallish chiller instead of four separate units. While those were traditionally only for...
  50. Replies
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    8,396

    You're on the right track by using a heat pump as...

    You're on the right track by using a heat pump as your primary heat source. A load calculation is the right way to know what size equipment to get; short of that, if the old equipment did OK, you...
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