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  1. If the garage door was not sealed after...

    If the garage door was not sealed after constructing the false wall, then moisture can get in between it and the false wall.
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    517

    What he probably means is that some folks might...

    What he probably means is that some folks might be tempted to install the damper very close to the trunk that is feeding the "takeoff" duct run that needs the damper, where the disc of the damper...
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    352

    Two stage systems are best suited for well...

    Two stage systems are best suited for well insulated, low leakage supply ducting that is not overly restrictive. Also best if paired with a variable speed blower that can turn down in low stage.
    ...
  4. If any form of HVAC system design went into this...

    If any form of HVAC system design went into this house, it should have specified how many cubic feet per minute (CFM) of supply air is supposed to be delivered to each supply register in the house....
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    Florida Joy, I was in your state for the first...

    Florida Joy, I was in your state for the first time January of this year; staying in Orlando for a weekend. When I arrived Friday night the weather felt like Dallas/Fort Worth in summer; warm and...
  6. Most major EMS/BMS front end packages have...

    Most major EMS/BMS front end packages have equipment scheduling and trending capabilities built into them, so I am not sure what you're after.
  7. If UTA had not snagged me when they did I would...

    If UTA had not snagged me when they did I would have been very tempted by this full time instructor gig at the ETC. As it is I'm glad to be an adjunct with TCC and hope there's a night slot for an...
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    x 2. Any other combustion appliances in the house...

    x 2. Any other combustion appliances in the house may backdraft if there is not enough makeup air for the exhaust hood.
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    1,937

    Being that it's a heat pump, if the leak(s) are...

    Being that it's a heat pump, if the leak(s) are at the indoor coil, running the system in heating mode might cause the refrigerant to leak out faster, due to the higher pressures at the indoor coil...
  10. During the reconstruction phase of your home,...

    During the reconstruction phase of your home, specify low VOC building materials and finishes. Indoor air quality is a combined effort of fresh air ventilation with "source control", the latter...
  11. If it turns out to be a water side leak I would...

    If it turns out to be a water side leak I would want the water treatment quality checked on the building loop.
  12. That thing looks bone dry. Are you sure the water...

    That thing looks bone dry. Are you sure the water supply is turned on to the humidifier?
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    951

    Actually, after rereading the OP, I realized the...

    Actually, after rereading the OP, I realized the house was two story with what appears to be a non-conditioned basement (63ºF @ 50%RH). Therefore I guessed the interior volume as 24,000 and reran the...
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    951

    I took the OP's stated CFM50 of 3,195 and came up...

    I took the OP's stated CFM50 of 3,195 and came up with a similar ACH natural as you, with some assumptions of course since I don't know the exact house interior volume nor exactly where it is or how...
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    951

    In your OP I picked up you clearly have comfort...

    In your OP I picked up you clearly have comfort and energy management goals in mind. You even get specific regarding indoor humidity levels. Therefore, if you showed me your energy audit, and further...
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    If that flex line passes without interruption...

    If that flex line passes without interruption from the shutoff valve to the gas valve inside the furnace (meaning it passes through the metal cabinet), that really needs to be changed: proper way is...
  17. If it is cooling fine but not heating well,...

    If it is cooling fine but not heating well, unless the building loop is very cold I don't think the problem lies there. Sounds more like one of the coils are underfed refrigerant, causing the low...
  18. Most people will attempt to solve this problem...

    Most people will attempt to solve this problem with various tweaks to the HVAC system, which are often met with various results. The core of the problem is building air leakage. This is the primary...
  19. If you keep your indoor air at 70 degrees and 45%...

    If you keep your indoor air at 70 degrees and 45% relative humidity, it means the temperature of the interior side of your window panes is at or below 48 degrees. This means two things: your indoor...
  20. If building management sets the water loop...

    If building management sets the water loop temperature, do they have an active way to monitor it? If the loop is on a cooling tower, much can vary in how closely the loop temperature is controlled....
  21. What beenthere is saying is right on for systems...

    What beenthere is saying is right on for systems that have both high and low return air inlets. Most residential HVAC installations in my area do not use dual return configurations. Most common are...
  22. Nice to hear a homeowner reporting positive...

    Nice to hear a homeowner reporting positive benefits from paying attention to the building envelope as well as the HVAC system.

    Remember, folks, the inside of your house is actually a huge duct....
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    UV lights are good for nuking biological growth...

    UV lights are good for nuking biological growth on cooling coils and coil condensate drain pans. That's it. But that is not a small "it" in respect to IAQ.

    That said, source control is the first...
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    I lived in an apartment about this size around...

    I lived in an apartment about this size around ten years ago. It also had a very similar problem; neighbor next door smoked and cooked very greasy meals. Return air path was building cavities but...
  25. Replies
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    776

    More thoughts: if your kitchen backs up to your...

    More thoughts: if your kitchen backs up to your smoking neighbor's kitchen, the dropped ceiling (often called a soffit or fur-down) over the cabinets may be common space between your kitchen and your...
  26. Replies
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    776

    Is the kitchen return grill the only return grill...

    Is the kitchen return grill the only return grill in the entire condo?

    Here are some of my preliminary thoughts based on the disclosed photos. The return from the kitchen (itself a...
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    577

    When you run the exhaust fan, it may be pulling...

    When you run the exhaust fan, it may be pulling cold air into the basement from outdoors via exposed basement walls and rim joists. Therefore that cold air is mixing with the air heated by the stove...
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    Condos and apartments that have the air handler...

    Condos and apartments that have the air handler tucked up into a dropped ceiling over a bathroom are notorious for problems like this. If your air handler is using the cavity created by the dropped...
  29. If your air quality guy can't nail it down for...

    If your air quality guy can't nail it down for you, a friend of mine in Houston likely can, or may know of someone closer to your location who can. In the meantime I'm hoping your guy can pinpoint...
  30. A few things I noticed in your original post: ...

    A few things I noticed in your original post:



    I know it isn't a very pleasant way to test, but what if you obtained a section of this insulation by itself and sniffed around it to see if that...
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    House was likely "stuffy" in the first place from...

    House was likely "stuffy" in the first place from high indoor humidity. Closing the windows while running the a/c might have prevented the coils from freezing up, and would have lowered indoor...
  32. I like Ecobee. It's a data logging machine, and...

    I like Ecobee. It's a data logging machine, and delivers good temperature control to boot. Can also overcool to dehumidify, and does not need its own router to connect to homeowner's wifi. Also...
  33. If the builder "forgot" to add insulation over...

    If the builder "forgot" to add insulation over your master bedroom, it would sure make me wonder what other "oops" lie there, waiting. I think this is why all new homes should have thermal imaging...
  34. Photos of master bedroom in floor plan show it...

    Photos of master bedroom in floor plan show it has a tray ceiling. These can be notorious air leakers; at minimum the insulation is often not done right around these architectural features,...
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    If your outdoor unit is 13 SEER and the indoor...

    If your outdoor unit is 13 SEER and the indoor air handler and coil is 10 SEER, I think it's a safe bet the indoor section is older than seven years. And with that said, the drain pan could be rusted...
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    3,343

    My understanding is that from 3,000 foot...

    My understanding is that from 3,000 foot elevation and less, one can stick with sea level based psychrometrics. 1,400 feet in elevation very modestly moves the needle, IMO, and to what extent it...
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    If the air handler is a draw-through, with the...

    If the air handler is a draw-through, with the evaporator coil on the suction side of the blower, there must be a trap on the condensate drain, and it must work properly, to prevent the air handler...
  38. If in the end they told you the capacitor was...

    If in the end they told you the capacitor was bad, the tech should have caught that the first day by checking the capacitor with his meter. Experienced techs can also look for indications a blower...
  39. Replies
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    3,343

    As Ikapigian said, the drop size will depend on...

    As Ikapigian said, the drop size will depend on the system tonnage requirement. For Vegas, your very same house might require a five ton system. For coastal California, maybe a three ton, or lower.
  40. So, on System "B", the actuator, attached to a...

    So, on System "B", the actuator, attached to a damper within the duct, I assume, modulates to control duct static pressure? If so, I'm wondering if you mean "transducer" instead of "potentiometer"....
  41. Replies
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    In order for a 4 ton system to flow enough air at...

    In order for a 4 ton system to flow enough air at 1,600 CFM through a round duct, and the velocity remain at or below 700 FPM, the duct diameter should be at least 20".

    At 17", if this is your...
  42. Replies
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    3,343

    For a lively discussion regarding powered attic...

    For a lively discussion regarding powered attic ventilators, check out this link:
    ...
  43. You can save some cash on the second tier...

    You can save some cash on the second tier systems, but if they are installed at a third tier or worse level, you won't even get second tier performance from them.

    There are differences among...
  44. Thread: New HVAC

    by Shophound
    Replies
    19
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    1,363

    This is why it is important to press for specific...

    This is why it is important to press for specific information to be included in any contract you enter into with a major purchase such as this. Yes, it is understandable you were depending on your...
  45. Thread: New HVAC

    by Shophound
    Replies
    19
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    1,363

    Look at your contract. Does it specify a certain...

    Look at your contract. Does it specify a certain combination of equipment? If so, is that what is installed?
  46. I once stayed at a hotel that had a PTAC (wall...

    I once stayed at a hotel that had a PTAC (wall unit, like yours) that drove me crazy. Every few minutes it made a distinct "tick" sound, whether the unit ran or not. Even leaving it off for...
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    If you want a comprehensive solution, you need to...

    If you want a comprehensive solution, you need to go find where all the moisture (humidity) sources are, whether they be originating inside the house, or coming into the house from moisture sources...
  48. Thread: XL20i noise

    by Shophound
    Replies
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    2,998

    Throughout this entire thread, unless I missed...

    Throughout this entire thread, unless I missed it, has been no effort by anyone looking at your system to measure total external static pressure (TESP), which, in this case, would be done with all...
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    I'm thinking the house might be 14 x 62, yielding...

    I'm thinking the house might be 14 x 62, yielding 870 square feet per floor. Of course, we are going off Zillow info, not real time info. Also, OP did not say what tonnage a/c system is.
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    Here's a house and a client crying out for...

    Here's a house and a client crying out for someone who can perform both a building envelope and HVAC system performance analysis. The OP's stated goals are improved efficiency of his system; I...
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