insulate the heat duct?

Discussion in 'HVAC Heating & Cooling' started by rburt5, Jul 30, 2008.

  1. rburt5

    rburt5 Member

    Canton, Ohio
    I have a large unheated crawl space under my family room. The family room is cold in the winter and warm in the summer. I'm thinking about wrapping the heat duct that runs through the crawl space under the room. Will this make a difference? Cost effective? If so, what kind should I use?

    P.S. - The heat duct runs about 18' though the crawl space.
  2. rburt5

    rburt5 Member

    Canton, Ohio
    Here is a photo of the crawl space (if it worked).:)

    Attached Files:

  3. Southern Man

    Southern Man DIY Hillbilly

    North Carolina
    I'd like to hear the pro's advice on this. I have ducts running in my attic- only the small ones are insulated.
  4. Marc46

    Marc46 HVAC Contractor

    Central Florida
    Both of you guys need to find out exactly what you have there.
    Rburt most likely has "internally" insulated sheet metal ducts, although I don't see "tack pins" in his pic.
    My eyes are not what they used to be!

    If not, would pay you to use duct wrap, even though it is in a crawlspace that appears to be well insulated.
    Drop a section, by taking off the drive connectors, and see if there is insulation inside of the sheet metal.

    Southernman, may have a similar circumstance.
    Externally wrapped round pipe "takeoffs", originating from an internally lined sheet metal trunk,.........or from a ductboard trunk.

    Details are needed to determine if your work, and expense will be a plus.
    Obviously more insulation can't hurt, but it is a cost,.....effort vs. expected savings issue.
    Last edited: Jul 30, 2008
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    New England
    What is probably as much of a benefit is to ensure there are no air leaks in the ducts - seal them properly so you get all of the conditioned air you've paid for.
Similar Threads: insulate heat
Forum Title Date
HVAC Heating & Cooling Radiant Heat, Pex Supplier, Parts, Outdoor Boiler Insulated Line Aug 17, 2012
HVAC Heating & Cooling Insulateing the Heat & Cooling Ducts Aug 16, 2007
HVAC Heating & Cooling Return on an outside wall! Keep it, or shut it off and insulate the bay? Help? Jan 31, 2010
HVAC Heating & Cooling Large insulated Central A/C pipe freezing Oct 9, 2009
HVAC Heating & Cooling Flexible insulated duct Jan 20, 2009

Share This Page