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Type: Posts; User: wyounger

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  1. Replies
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    1,988

    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...
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    446

    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...
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    659

    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...
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    593

    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...
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    761

    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...
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    1,234

    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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    1,137

    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...
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    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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    3,940

    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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    1,988

    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...
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    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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    1,640

    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...
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    721

    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.
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    1,958

    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...
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    610

    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...
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    610

    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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    1,958

    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...
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    1,958

    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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    1,958

    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...
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    858

    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
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    858

    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...
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    781

    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
    Views
    891

    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...
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