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  1. Static pressure is about 0.35

    Static pressure is about 0.35
  2. I removed the grill and it made no difference. ...

    I removed the grill and it made no difference.

    Note that the size of the opening into the return duct is 13.75" x 24.75" (the border of the grill is 1.25")

    Note: the noisiest ducts are ones...
  3. Let me clarify. The total size of the grille is...

    Let me clarify. The total size of the grille is 16" x 26". The borders are 1.5".
    Hmn, when I take the grille off I will measure the actual size of the duct.
  4. If I have to spend upwards of $1000 (after taking...

    If I have to spend upwards of $1000 (after taking into account the need to re insulate) to really solve the problem, and end up with a bunch of flex that (though it may be silly of me) I don't...
  5. Interesting idea, but that's not something I, the...

    Interesting idea, but that's not something I, the just enough to be dangerous homeowner, want to touch.
    Also, I think that "most installers" is more accurately written as "almost all installers"!
    ...
  6. Somewhat off topic, I had wondered if there was...

    Somewhat off topic, I had wondered if there was some way to keep the unit in first stage more of the time. I am willing to accept a moderate rise (or drop) in house temperature during times where...
  7. I did read that, and wondered why "comfort" ...

    I did read that, and wondered why "comfort" would matter -- so your further explanation is appreciated!

    For AC: Here in Maryland (near DC) the humidity is a real issue (more so than heat). So...
  8. I should note that as an experiment, I had a...

    I should note that as an experiment, I had a "duct muffler" installed on one the ducts (it replaces a 4' section of duct, and was installed near the register). That helped reduce the noise emanating...
  9. I will try, but will be shocked (and pleased) if...

    I will try, but will be shocked (and pleased) if it makes a difference!
  10. 1) In cooling, I set it to "quiet". The...

    1) In cooling, I set it to "quiet". The installation manual says "minimum cooling airflow that the system can safely use (typically 300CFM). Use this setting if duct noise is a severe problem...". In...
  11. More info: 9 ceiling registers, 11x7 edge to...

    More info:
    9 ceiling registers, 11x7 edge to edge (about 9 x 6 internal)
    1 return register: 16 x 26 (13 x 23 internal)
    Return duct: 18" x 18" x 80"
    Main supply duct: 18" x 18" x 80" with 5...
  12. Thanks for the replies. Perhaps some more details...

    Thanks for the replies. Perhaps some more details would help.

    Background: The house is a 1400 sq ft rambler in Maryland. This system replaced an 18yr old 2 ton Seer 13 AC system that cooled...
  13. Noisy grills and Carrier Infinity system, but can't lower fan speed enough

    A year ago I replaced the flex duct in the attic with hard duct, and installed a 2-ton 2-stage Carrier AC/HP (25hnb924a) that uses the Infinity thermostat.
    While the system heats and cools wells, it...
  14. meddlesome homeowners occassionally correct :)

    Can't say as I blame you, but sometimes we (homeowners) spend a lot of time researching a particular system (the one we are gettting in$talled).

    For example, I installed this system in parallel...
  15. pulling vacumn

    Thanks for the tip. It's always a bit of a challenge telling workmen such technical chores (they tend to look at homeowners as meddlesome dopes), but there are ways..
  16. Carrier 24HNB9 compressor failure after 3 months... cause for long term concern?

    Hello.

    Back in June I installed a new Carrier Heat pump (25hnb924A003 -- 2 ton 2-speed 19 seer).

    It worked quite nicely throughout the summer. In September, with the pleasant weather here...
  17. It does get dry in the house in the winter (my...

    It does get dry in the house in the winter (my skin notices it). But the boiler is in the cellar, and the hvac duct work is in the attic, no water up there (the AC was a retrofit when we moved in)!...
  18. The installers weren't that interested in an HP...

    The installers weren't that interested in an HP at all, I kind of had to talk them into it. So their advice has been minimal, I have tried to figure it out.
    BTW: Got an Aprilaire 13MERV, no...
  19. Upon factoring in that feature ... my maybe just...

    Upon factoring in that feature ... my maybe just got a lot more "maybe not" !
  20. Thanks. When next I talk to the contractor I will...

    Thanks. When next I talk to the contractor I will ask for this.
    Or maybe I will be ambitious and try it myself :<>
  21. That sounds like a good solution. I assume the...

    That sounds like a good solution. I assume the existing two wires coming from the boiler would be used -- they would split (before getting to the Infinity tstat); with one pair going to the Infinity...
  22. Yep, the boiler runs on natural gas (been using...

    Yep, the boiler runs on natural gas (been using it for heat since I bought the house in 1992).

    Truth be told, haven't actually used the HP in cold weather (just got it installed in June 2012)....
  23. Almost:, no hydronics in AHU; boiler is used...

    Almost:, no hydronics in AHU; boiler is used below freezing (I have hp set to shut off at oat of 35 degree, at which point the boiler kicks in ).

    The problem with your idea is that 99% of the time...
  24. Which to hook up? Just the fan coil breakers...

    Which to hook up? Just the fan coil breakers (not the condenser breakers)? How to suppress the fan (no need to push air)? Also, the breakers would take up several spaces in the transfer switch sub...
  25. Carrier Infinity and power outages: solutions?

    In May I upgraded my 18yr AC to an Infinity Carrier HPAC (25HNA9). This works with my aging (but still functional) natural gas boiler. An interface relay kit (KFAIF0101HWC) is installed so that...
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    At risk of repeating myself (see prior posts), I...

    At risk of repeating myself (see prior posts), I had a lot of that done. I don't have the exact numbers in front of me, but prior to sealing (followed by 12" cellulose blow in), the blower door test...
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    I don't have a problem with that. But who .. the...

    I don't have a problem with that. But who .. the HVAC people I have been using (who redid my duct work and installed the Carrier Infinity) don't have any obvious expertise on venting.
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    That makes for a difficult combination: (a) don't...

    That makes for a difficult combination: (a) don't use a high flow powered vent, and (b) passive ventilation is unreliable!

    Toungue out of cheek -- rheostat is an interesting idea; but how does one...
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    The roofing company I have been dealing with (who...

    The roofing company I have been dealing with (who have done competent work recently) quoted me $700 for a 2000CFM. They seemed to think that would work just great.

    Maybe I could get a better...
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    I seem to have hit a sore spot (2 comments on who...

    I seem to have hit a sore spot (2 comments on who understands building science better)!

    My answer is: given the thoughtfulness of the comments, HVACers.

    Alas, even the HVACers can't say whether...
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    Hi _la. I responded earlier but it seems to...

    Hi _la. I responded earlier but it seems to have gotten lost, so I will respond again.

    I do keep your advice in mind, which is why I am skeptical of the roofing.com opinions, and those of my...
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    The answers on this HVAC site have been more...

    The answers on this HVAC site have been more thoughtful. But these answers aren't definitive on how to put enough passive vent on a hip roof.

    Hence the idea of giving up and installing PAV has...
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    I posted this question on roofing.com, and the...

    I posted this question on roofing.com, and the answers (all 2 of them) were "use PAV". So either roofers think different than HVAC people, or my sample of 2 is just odd.
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    Sounds like you would recommend "mushroom" or...

    Sounds like you would recommend "mushroom" or similar static vents.
  35. Replies
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    >I used the single sided RB white kraft paper...

    >I used the single sided RB white kraft paper with nylon scrim
    >and foil on one side. it does have small perforations.
    When I bought the roll 2 months ago (via the web), it seemed that not much...
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    Hi. Just to be sure I understand your comment:...

    Hi. Just to be sure I understand your comment: you have actual experience installing hip venting, and found it to NOT do a good job at exhausting attic air?

    Thanks
  37. Replies
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    [QUOTE=energy_rater_La;13617311 >]hot humid...

    [QUOTE=energy_rater_La;13617311
    >]hot humid climate lots of condensation issues here.
    >where outside RH is 80% on a good day.
    And I thought DC summer climate stunk!


    >does rb have to be air...
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    >that is the difference between our climates. if...

    >that is the difference between our climates. if our ducts touch insulation..or each other..they condensate.
    Louisiana?

    >its a shame you have to request mastic, and make sure it is used....
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    >>it was interesting. thanks for the...

    >>it was interesting. thanks for the details.where are you located?

    Maryland (DC suburbs)

    >if you put foil bubble foil wrap on ducts n a vented attic here, you get condensation.
    >usually...
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    WTH, since this seems to be of interest, here are...

    WTH, since this seems to be of interest, here are the details.

    Before my upgrading, I had poorly done flex duct and 3 to 6 inches of fiberglass bats.
    I first had the duct work replaced -- all...
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    It appears I have several uncertain choices: go...

    It appears I have several uncertain choices: go PAV and seal up the current ridge vent, or install hip ridge vents, or power intake, or just live with it. I don't think I could get a clear...
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    Ugh, I just spend $3k or so sealing the attic and...

    Ugh, I just spend $3k or so sealing the attic and blowing in 12" of cellulose (not to mention the costs of the soffit and ridge vent). It seems like overkill to foam it.
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    Well, this does effect HVAC efficiency (ductwork...

    Well, this does effect HVAC efficiency (ductwork in attic), and this topic has been discussed in the past on hvac-talk. That said ... thanks for the tip -- I will check out roofing.com.
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    Hip Ridge Vent or not

    M hip roof attic, 1200 sq feet, has about 12 feet of ridge; on which I have 10 feet of Shingle Vent II. That's not enough -- the attic hits 135 on sunny days in June (Maryland). And my ductwork is...
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    It's a 1958 house. Roof is 15 year old composite...

    It's a 1958 house. Roof is 15 year old composite shingle.
    When I bought it it just had the roof fan. With no soffet vents. Well, a few, that were covered with unslotted vinyl. Great setup! I did...
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    The problem is I am maxed on ridge vents, at...

    The problem is I am maxed on ridge vents, at about 1x ridge vent to 2.5x soffet vent. I understand that the roof vent may pull air from the outside through the ridge vent.... but I presume not only....
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    Attic ventilation: fan or not to fan

    In Maryland, I have a 1200 sq ft, 1 story rambler with a hip roof on a more or less rectangular plan. In the summer, the attic gets hot.

    When I got the house, it had a roof fan.Per what seems to...
  48. Duct work/fan coil are in the attic (its a...

    Duct work/fan coil are in the attic (its a retrofit) boiler is in the basement. I would rather not mess with sending a pipe up to the attic. Besides, I kind of like radiant heat.
  49. Thanks for the quick reply. So I think what...

    Thanks for the quick reply.

    So I think what you are saying is that you have two separate thermostats: one for the HP/AC, and one for your natural gas boiler. And you set the HP setpoint (in the...
  50. Carrier HP with existing hot water baseboard heat

    I am considering upgrading an 18yr old two-ton AC to a 19 Seer two-stage Carrier (24ANB124), with matching fan coil and infinity thermostat. Well, it would be about 10% more to install a similarly...
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