Search Results - HVAC-Talk: Heating, Air & Refrigeration Discussion

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  1. Replies
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    1,522

    A round radius elbow definitely has less...

    A round radius elbow definitely has less resistance to airflow than a square box with a hole cut in it, get the contractor back to replace the box with a proper fitting - If he could fit a square...
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    4,862

    Agree on NOT using foam of any type to "seal"...

    Agree on NOT using foam of any type to "seal" light fixtures, it is not rated for temperatures that high. The thermal limits in sealed lights are set at 196 F, and they can easily exceed that if they...
  3. FIRST -You need to seal the house until you are...

    FIRST -You need to seal the house until you are at .35 ACH natural, any home performance contractor or energy audit firm can do this for you, it sound like you are currently at 4-5 ACH natural.
    ...
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    This forum is not setup/intended to help you fix...

    This forum is not setup/intended to help you fix problems with your heater. No one is going to help you diagnose the problem, it's against the forum rules...

    -you need to call a professional, so...
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    CAZ testing ensures that your home is not pulling...

    CAZ testing ensures that your home is not pulling products of combustion INTO your home, as they can kill the occupants of your home, typically at night while you are sleeping...

    It cannot be...
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    4,862

    Remember that attic ventilation (per building...

    Remember that attic ventilation (per building code) was primarily designed to remove attic moisture caused by condensation in cold months & was never intended to be robust enough to keep the attic...
  7. Replies
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    4,862

    Unvented attic assemblies are "semi-conditioned"...

    Unvented attic assemblies are "semi-conditioned" spaces, they are not directly heated or cooled, but there is not any insulation on the attic floor, so the only thing between the attic space and the...
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    4,492

    Closed Cell spray foam - cover the ducts with 2"...

    Closed Cell spray foam - cover the ducts with 2" (R-14), remove the gravel and spray foam the entire roof, make sure you check the UV coating they will apply over the spray foam, have a comfortable...
  9. Replies
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    3,790

    5-tons is Waaaay over-sized for 2200 sq ft in CA....

    5-tons is Waaaay over-sized for 2200 sq ft in CA. Desert climate, no moisture removal needed at all, we size for 98% sensible cooling and only 2% latent heat removal.

    Air-seal - insulate - install...
  10. Have you checked the air sealing and insulation...

    Have you checked the air sealing and insulation on the upstairs rooms that are too cold?

    If not, have someone look at the rooms with a thermal camera and make sure that there is not a higher than...
  11. Thread: Open return?

    by HVAC_BILL
    Replies
    10
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    1,154

    If your natural draft water heater is located in...

    If your natural draft water heater is located in the basement - you are pulling flue gas back into your home when the heater is running...

    Many CO detectors are not very accurate, but you may be...
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    I have found that people would rather pay a bunch...

    I have found that people would rather pay a bunch of extra $$$ for higher SEER equipment with the hope of energy savings, than spend some $$ upfront to get a energy audit performed up-front and it...
  13. Thread: Sorry

    by HVAC_BILL
    Replies
    5
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    649

    noquincy - where is your home located? city...

    noquincy - where is your home located? city state?

    Your equipment should only be sized by a proper manual J calculation, almost all the systems I review are way over-sized.

    In Northern...
  14. Replies
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    1,590

    OP - With due respect to our friends from back...

    OP - With due respect to our friends from back East, when its warm enough for your AC system to run in the SF Bay Area, the humidity is not an issue.

    In California we typically want 98% sensible...
  15. Replies
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    RE: Spray Foam Attic Typically the spray foam...

    RE: Spray Foam Attic

    Typically the spray foam insulation covers the underside of the roof deck and the Gable Ends. This includes "creating" a gable end to separate the attic over the conditioned...
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    To the OP: your question "Basically, I would...

    To the OP:

    your question "Basically, I would like to know if what I am asking them to do is reasonable."

    Its not reasonable to expect a complicated duct design to meet your liking, unless it...
  17. If you are worried about creating a "double"...

    If you are worried about creating a "double" vapor barrier on the duct surface, do not worry about it. typically we worry about double vapor barriers trapping moisture, but there is still insulation...
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    The most important thing with home performance is...

    The most important thing with home performance is getting a good air seal, especially in an older home. It does not do much goos to install a bunch of Insulation if the air is going to leak right...
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    I would check for an air leak behind the...

    I would check for an air leak behind the thermostat where the t-stat wire comes through the wall. If there is a cold draft into the T-stat, it will cause short cycling...

    How old is the...
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