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  1. #1

    How much insulation under air handler

    First post .Be gentle I bruise easily

    Just had Rheem split system in Tues. The 40 yr old LP furnace had a rotten
    piece of fiberglass insulation underneath it in the bottom of the hole .I threw it out . There was another black piece of insulation tacked to the bottom it was funky too but since it was nailed in I left it, So they come out to install and I forgot to replace the one I threw out! They did not say anything.
    Did I screw up? and now will lose 30% 0f heat out the house foundation?
    How much insulation is needed down there? Thanks

  2. #2
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,619
    Quote Originally Posted by tubbyray View Post
    First post .Be gentle I bruise easily

    Just had Rheem split system in Tues. The 40 yr old LP furnace had a rotten
    piece of fiberglass insulation underneath it in the bottom of the hole .I threw it out . There was another black piece of insulation tacked to the bottom it was funky too but since it was nailed in I left it, So they come out to install and I forgot to replace the one I threw out! They did not say anything.
    Did I screw up? and now will lose 30% 0f heat out the house foundation?
    How much insulation is needed down there? Thanks
    I picture would help also is the unit up flow or down flow

  3. #3
    Join Date
    Jun 2010
    Location
    Philadelphia PA
    Posts
    2,190

    If I understand your post

    How much insulation under air handler
    the answer is NONE!!! The reason your unit rotted ou was the insulation allowed the surface of the unit to hit dewpoint and the liquid water was soaked up by the insulation and never went away

    Leave an airspace all around the unit so even if it sweats it will eventually dry out/ off
    You have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!

  4. #4
    Thank you. It is a down flow and I am glad I did not replace the old insulation under the old furnace!

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