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  1. #14
    Join Date
    Oct 2016
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    The insulation boosts efficiency in cooling also. With less insulation the suction gas gets warmer and becomes less dense. The compressor moves the same volume of gas, but less mass. So, you get a little less cooling with the higher superheat. I’d say very little difference from .5 to .75 inches of armaflex, but still different on paper.

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  3. #15
    Join Date
    Apr 2018
    Location
    torrington CT
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    24
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    thicker insulation is usually needed where the line is exposed to higher temperatures like outside, on a roof, or in an attic. it is also recommended that the liquid line be insulated in these areas

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  5. #16
    Join Date
    May 2017
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    27
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    Energy codes already require thicker insulation on linesets...just don't get enforced. Another benefit of small gains in efficiency could be seen in slightly extended system life from doing less work over time.

  6. #17
    Join Date
    Sep 2005
    Location
    Atlanta GA area
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    38,097
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    Had a situation where the lineset went through a crawl (concrete floor)... suction line had 3/8 insulation on it.

    The insulation had become water-logged with sweat... and was dripping... thus adding humidity to the house.

    Removed the insulation and replaced it with 3/4, joints well taped... no more added humidity.

    Note this was in Atlanta, which has humid summers.
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

  7. #18
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    18,322
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    For the record here Georgia uses the 2007 IECC (Energy Code) which requires a minimum of 1/2" up to 7/8" Armor Flex for the suction pipe and 1" insulation for 1" diameter pipe and over.

    In 2020 we will be using the 2015 energy code which requires R-3 insulation on all pipe below 55 F which means 3/4" minimum insulation for all pipe regardless of pipe diameter. Just a heads up. Thank you very much
    "I could have ended the war in a month. I could have made North Vietnam look like a mud puddle."

    "I have little interest in streamlining government or in making it more efficient, for I mean to reduce its size. I do not undertake to promote welfare, for I propose to extend freedom. My aim is not to pass laws, but to repeal them. It is not to inaugurate new programs, but to cancel old ones that do violence to the Constitution."
    Sen. Barry Goldwater

  8. #19
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    38,097
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    Quote Originally Posted by glennac View Post
    For the record here Georgia uses the 2007 IECC (Energy Code) which requires a minimum of 1/2" up to 7/8" Armor Flex for the suction pipe and 1" insulation for 1" diameter pipe and over.

    In 2020 we will be using the 2015 energy code which requires R-3 insulation on all pipe below 55 F which means 3/4" minimum insulation for all pipe regardless of pipe diameter. Just a heads up. Thank you very much
    Any variance for colder pipes... like low temp suction lines???
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

  9. #20
    Join Date
    Jun 2002
    Location
    Dacula, GA
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    18,322
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    Quote Originally Posted by ga-hvac-tech View Post
    Any variance for colder pipes... like low temp suction lines???
    No variance for colder lines. Just everything below 40F and in 2020 below 55F. One size fits all for the minimum. Not to say you shouldn't use more insulation though. I would for super cold lines. Thank you very much
    "I could have ended the war in a month. I could have made North Vietnam look like a mud puddle."

    "I have little interest in streamlining government or in making it more efficient, for I mean to reduce its size. I do not undertake to promote welfare, for I propose to extend freedom. My aim is not to pass laws, but to repeal them. It is not to inaugurate new programs, but to cancel old ones that do violence to the Constitution."
    Sen. Barry Goldwater

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