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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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    1,598

    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...
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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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    1,752

    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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    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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    1,084

    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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    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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    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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    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...
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    844

    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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    426

    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?
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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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    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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    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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    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...
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    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...
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    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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    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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    1,499

    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?
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