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  1. Replies
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    Your house is already at negative pressure, based...

    Your house is already at negative pressure, based on your observation that outside air is coming into the house through the new vent when the furnace isn't running. Your new vent on the access door...
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    1,654

    Have you checked the air filter? Are all the...

    Have you checked the air filter?

    Are all the air returns clear (i.e., not blocked by furniture or whatever)?

    I agree with others' comments to have a tech check to see if the fan is working OK...
  3. You may want to have a HVAC contractor see if...

    You may want to have a HVAC contractor see if it's feasible to install a balancing damper in the main supply duct to the first floor. Then use the damper (in summer) to throttle back airflow to the...
  4. Prior to this, I don't think you mentioned the AC...

    Prior to this, I don't think you mentioned the AC or furnace would be 2-stage. What you are describing is not typical for a 2200 sf residential installation. You need to bring in a HVAC contractor...
  5. Isolating air to multiple zones could cause...

    Isolating air to multiple zones could cause insufficient airflow through the A/C coil, and you could get into the freezing coil issue. It would also not be good for a furnace to have airflow shut...
  6. You said the supply ducts for the house will be...

    You said the supply ducts for the house will be split into four zones -- 1st floor, 2nd floor, office, and basement, but they're all going to be fed by a single 3-ton A/C unit? If so, then I don't...
  7. Replies
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    The "path of least resistance" comment is valid. ...

    The "path of least resistance" comment is valid. Return openings closest to the furnace tend to draw more air than the ones farther away from the furnace. Blanking the return in the basement may...
  8. Thread: CRAC Mfg?

    by PowerPlay
    Replies
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    1,842

    CRAC Mfg?

    Looking to replace three Liebert 15-ton CRAC units (data center room air conditioners), DX downflow into raised floor. Other than Liebert, who else makes these things?
  9. Replies
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    2,392

    My system uses two 16x25x1 filters arranged in an...

    My system uses two 16x25x1 filters arranged in an inverted V in the return duct. Never had a problem in 15 years of operation using MERV 8 filters.
  10. Replies
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    1,122

    If a 2-stage furnace is able to maintain the...

    If a 2-stage furnace is able to maintain the desired house temp in "bitter weather" while only running on "gentle low", then would that mean the furnace is oversized?
  11. Replies
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    1,122

    This is interesting because an experienced tech...

    This is interesting because an experienced tech told me it's been his observation that customers seem more satisfied with 2-stage heat controlled by the furnace rather than a 2-stage thermostat. It...
  12. Replies
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    1,122

    Last fall I had a new 2-stage Trane XV80 gas...

    Last fall I had a new 2-stage Trane XV80 gas furnace installed and it runs just fine with my single-stage thermostat. Staging is controlled internally by the furnace, however switches on the...
  13. I agree. Something doesn't add up. 7.4 cents...

    I agree. Something doesn't add up. 7.4 cents per kWH x 1688 kWH = $125 (roughly)
  14. Replies
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    1,450

    If you're running the furnace fan continuously in...

    If you're running the furnace fan continuously in the winter, you should replace the filters more often, like maybe once a month. That's more important than the brand of filters you use. Cleaner...
  15. Replies
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    885

    80% Furnaces Unavailable in 2013?

    Is it true that in mid-2013, the US Dept. of Energy will prohibit sale of residental gas furnaces that are less than 90% efficient, in the northern tier of states?
  16. Replies
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    443

    2-Stage 80% Furnace

    Just had a new 2-stage 80% gas furnace installed recently. (Trane XV80)

    How can I tell when the thing is on Stage 1 fire vs. Stage 2 fire? Does the fan run at the same speed for both?
  17. Replies
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    Can you please describe exactly what a lien...

    Can you please describe exactly what a lien waiver is, and how one should ask for it?
  18. Replies
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    2,026

    Not all the things I listed are attributable to a...

    Not all the things I listed are attributable to a single person. It's a compilation from multiple individuals.

    The last item seems to be more often from higher bidders who are trying to justify...
  19. Replies
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    2,026

    How To Lose Out on a Job

    Be at least 30 minutes late to your scheduled visit with the Owner.

    Act like a load calc is a waste of your time.

    Act like you know everything and the Owner knows nothing about HVAC.
    ...
  20. Replies
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    4,150

    I'm confused by the question. The rating of...

    I'm confused by the question.

    The rating of your system is based on specific conditions of the incoming air to the unit. The actual share of latent vs. sensible depends on the actual...
  21. Replies
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    795

    How Is A-Coil Supported?

    I have a traditional system where the A/C A-coil resides above a vertical upflow gas furnace.

    How is the weight of the A-coil supported? From below, by the furnace, or from above, by the supply...
  22. Replies
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    1,550

    I'm in Omaha NE. Another HVAC contractor...

    I'm in Omaha NE. Another HVAC contractor confirmed that Trane is discontinuing the XL80. I'll probably end up with XV80.
  23. Replies
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    1,550

    Contractor claims the local Trane equipment...

    Contractor claims the local Trane equipment distributor says XL80 is no longer available, in spite of what is on Trane's website. I am getting a couple more bids so I'll see if the other...
  24. Replies
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    1,550

    Has Trane Quit Making XL80 Furnace?

    I asked for a proposal to replace existing furnace with a new Trane XL80, and the contractor is telling me Trane has quit making the XL80 model. Is this true?
  25. Bypass Humidifier - Aprilaire or Honeywell?

    Will soon be replacing my whole-house bypass humdifier, which is a 22-year-old Aprilaire. Trying to decide between Aprilaire 600M and Honeywell HE265. Anyone have thoughts on which is better?
  26. Replies
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    When that high-efficiency motor needs replacing,...

    When that high-efficiency motor needs replacing, how much will that cost, compared to a standard motor?
  27. Electric codes vary by state and county? I...

    Electric codes vary by state and county? I don't think so. They probably all defer to the National Electrical Code (NEC). Get yourself a copy. Better yet, get yourself a licensed electrician.
  28. Replies
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    2,432

    Sorry but that still makes no sense. Read your...

    Sorry but that still makes no sense. Read your statement again. You appear to be saying that a heat pump can produce more energy than it consumes.

    Or are you trying to say that a heat pump will...
  29. Replies
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    2,432

    A new 80% furnace will probably be quieter than...

    A new 80% furnace will probably be quieter than the 20-year-old 70% unit I have now. And the existing one has not been bothersome from a noise standpoint.
  30. Replies
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    2,432

    A/C is not ready for replacement yet. You're...

    A/C is not ready for replacement yet. You're saying one therm of heat from an 80% gas furnace will cost four times more than one therm of heat from a heat pump? Sounds awful high to me.
  31. Replies
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    2,432

    Can you please define what PSC and ECM mean?

    Can you please define what PSC and ECM mean?
  32. Replies
    31
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    2,432

    Two exposed 3" pipes would ruin the aesthetics of...

    Two exposed 3" pipes would ruin the aesthetics of the finished basement, no matter what color they're painted.
  33. Replies
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    2,432

    A high-efficiency furnace would require intalling...

    A high-efficiency furnace would require intalling a new exhaust duct to an exterior wall, and perhaps a new combustion air duct as well. The only route to an exterior wall is through a finished...
  34. Replies
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    Which I would not need if I went with an 80% AFUE...

    Which I would not need if I went with an 80% AFUE unit, correct?
  35. Replies
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    2,432

    "The 80% furnaces normally have a 20-year...

    "The 80% furnaces normally have a 20-year warranty."

    Trane XV80 has a lifetime HX warranty, and it's an 80% AFUE two-stage unit with a variable speed motor.


    "...at lower speeds, the...
  36. Replies
    31
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    2,432

    Don't the higher-efficiency furnaces have special...

    Don't the higher-efficiency furnaces have special exterior ducting requirements for combustion air and/or exhaust? This unit is not in easy proximity to an exterior wall for running additional...
  37. Replies
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    2,432

    New Furnace Questions

    My gas furnace will be replaced soon, probably with a 80% AFUE unit. What are the pros and cons of single-stage vs. two-stage furnace? Is it worth getting a unit with a variable speed fan motor?...
  38. Replies
    3
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    534

    All Season Tires

    I'm looking to replace the tires on my car. I want all-seasons that are good in snow. I don't want to put dedicated snow tires on. Any suggestions?
  39. beenthere has an excellent point. Check the...

    beenthere has an excellent point.

    Check the location of your "bypass." If it's not downstream of your cooling coil, it won't do what you think it will do.
  40. If your thermostat is set higher, your A/C may...

    If your thermostat is set higher, your A/C may not run as often, and it can't remove humidity unless it is running.

    The A/C system is designed to cool the house. In the process it also...
  41. "My theory is the drier air from the supply would...

    "My theory is the drier air from the supply would be further dried when mixed in with the return air"

    This may reduce the moisture content of the airstream hitting the cooling coil. So it may...
  42. The A/C system will run as needed to maintain the...

    The A/C system will run as needed to maintain the set temperature wherever the thermostat is located.

    Temperature is not necessarily going to be uniform throughout the house.

    Ditto the...
  43. Replies
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    5,701

    Your last post says you're about 55-60% relative...

    Your last post says you're about 55-60% relative humidity throughout the house with the tstat at about 72 degrees.

    60% RH at 72 degF translates to a dewoint of less than 60 degrees which should be...
  44. Replies
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    861

    I tried the NaturalAire MERV 8 filters from Home...

    I tried the NaturalAire MERV 8 filters from Home Depot that come in a 3-pack (which gary_g said he uses). With these filters in place, about one minute after the furnace would shut down, I would...
  45. Replies
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    477

    Duct Dimension Question

    Please forgive my ignorance

    If a rectangular duct is shown on a drawing as 12/18, does that mean 12" high x 18" wide or the other way around?
  46. Replies
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    523

    Furnace Questions

    I have a standard efficiency gas furnace that is nearly 20 years old.

    The furnace has a regular exhaust vent that goes to the roof. There is an open 12-inch duct near the furnace which Iím...
  47. Replies
    14
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    1,724

    Most two-story homeowners like me are stuck with...

    Most two-story homeowners like me are stuck with a single-zone system, so we make the best of what we have.

    In my house, the 2nd floor gets too warm with all the downstairs registers wide open...
  48. Replies
    14
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    1,724

    I've been doing that for years with no apparent...

    I've been doing that for years with no apparent ill effects.
  49. Replies
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    849

    Chiller kW/Ton

    What kind of efficiency (kW/Ton) is typical for a new chiller, 300-350 ton capacity, in an ice-making application? (chilling brine or glycol solution to about 23 degF)
  50. Replies
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    Thermal Services replaced my home's A/C in 2001...

    Thermal Services replaced my home's A/C in 2001 and has done all our HVAC service since then. We've been happy with their service and the professionalism of their techs.
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