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  1. Replies
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    My statement was in context of a 105 degree day...

    My statement was in context of a 105 degree day with 98% humidity, but I see your point.
  2. Replies
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    Yeah, and that's open up the windows and shut off...

    Yeah, and that's open up the windows and shut off the a/c weather in Texas.... :grin2:
  3. Replies
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    These three photos tell me a lot of things going...

    These three photos tell me a lot of things going on at your house. With the assumption that in the third photo you are looking up toward the attic, notice how much dirt and dust has collected where...
  4. Residential server farm. You should definitely...

    Residential server farm. You should definitely consider treating that room like a commercial server room: separate HVAC from rest of building. A mini-split might be a good choice as it can run when...
  5. "Storage engineers"? Does that involve a room...

    "Storage engineers"? Does that involve a room with lots of computer servers or something?

    If you have a room with a substantially different heat gain/loss profile than the remaining zones served...
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    207

    Your expectations are only misaligned if they...

    Your expectations are only misaligned if they include a free load calculation. To do such a calculation correctly, it takes time.

    Did you have a home energy audit done prior to your insulation and...
  7. This sounds more like a complaint about the...

    This sounds more like a complaint about the system's noise and location vs. sweating windows in winter.

    If the HRV solved the window sweating problem you should take up the noise and location...
  8. Replies
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    207

    Most contractors are understandably reluctant to...

    Most contractors are understandably reluctant to perform load calculations at no charge.

    A load calculation is preferable for new construction, for additions to existing structures, or if...
  9. Replies
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    That's the "special" register with its "special"...

    That's the "special" register with its "special" Ak for those "special" air distribution patterns that normal registers just can't hack.
  10. Replies
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    Duct leakage test (duct blaster) can determine...

    Duct leakage test (duct blaster) can determine rate of leakage and assist in finding the leaks. Where the zip ties are used but no mastic applied are potential leak points. Where I at your house...
  11. Do your homework on bidders before you sign a...

    Do your homework on bidders before you sign a contract. Find out how well others are satisfied with their work.
  12. Replies
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    1,358

    I would add checking for supply air duct leakage...

    I would add checking for supply air duct leakage to that list, and having the house blower door tested at some point.
  13. Replies
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    1,358

    With return ductwork in attic I would want its...

    With return ductwork in attic I would want its entire length, and all of its connections and fittings, checked for air leakage. Even with your recent wet weather, the intense attack against high...
  14. Replies
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    1,358

    Where is the indoor unit located? Attic, in...

    Where is the indoor unit located? Attic, in house, basement?
  15. Air handler in garage likely sucking in exhaust...

    Air handler in garage likely sucking in exhaust fumes from autos in garage. Air handlers should not be in a garage, or share a wall with one with platform return. But if it must live there then...
  16. If you've cleaned the coil and fixed the duct,...

    If you've cleaned the coil and fixed the duct, watching the system over 24 hours will determine if you've solved the problem or have more homework to do.

    No telling if the system charge was...
  17. Need to know what type of metering device is on...

    Need to know what type of metering device is on the evap coil. Allstyle coil makes me think it's a piston and if so, the orifice size of the piston should match what's stamped on the condenser...
  18. The long timeframe for duct replacement also...

    The long timeframe for duct replacement also caught my eye. Months to reduct a 4,000 square foot house? Makes me wonder if this is one of those giraffe barn type homes with lofty ceilings and framing...
  19. I want to hear the story why you're replacing the...

    I want to hear the story why you're replacing the young Carrier system.
  20. Replies
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    206

    UV lights can keep coils and pans clean, but can...

    UV lights can keep coils and pans clean, but can also destroy anything not resistant to UV rays that are exposed to the lights.

    UV lights do not sanitize air passing over the light or its sphere...
  21. 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.
  22. Replies
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    611

    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...
  23. Replies
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    454

    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.
    ...
  24. 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....
  25. Replies
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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...
  26. 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.
  27. 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...
  28. Replies
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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.
  29. Replies
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    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...
  30. 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...
  31. 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.
  32. 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?
  33. Replies
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    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...
  34. Replies
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    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...
  35. Replies
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    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...
  36. Replies
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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...
  37. 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...
  38. 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...
  39. 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...
  40. 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....
  41. 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...
  42. 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....
  43. Replies
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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...
  44. Replies
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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...
  45. Replies
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    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...
  46. Replies
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    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...
  47. Replies
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    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...
  48. Replies
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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...
  49. 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...
  50. 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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