Results 1 to 9 of 9
  1. #1

    Humidifier on return or duct above furnace?

    I have a heat pump system with gas backup. One pro said they always install flow-through humidifiers on duct above the furnace. The other said they prefer to install a bypass type on the return for the reason that 1) if it leaks it won't ruin the furnace (they apparently encountered that many times. 2) in summer time with cooling on they see humidifiers sweat and drip condensation when installed on duct.

    What is your experience? What are pluses and minuses of each install?

  2. #2
    Join Date
    Feb 2008
    Location
    ga.
    Posts
    85
    Makes Sense, Would Not Be An Issue Unless Above Control Side Of Furnace. But I Would Go With Steam Humidifier, If That Is Out Of Price Range Then Fan Powered Instead Of By Pass.

  3. #3
    Join Date
    Apr 2006
    Posts
    150

    Humidifiers

    No excuses not to go with "NEW" honeywell steamers...check them out. Price is reasonable and you can install them up to 20' remote from Supply duct.

  4. #4
    Join Date
    Dec 2007
    Location
    Ohio
    Posts
    2,876
    A bypass will do just fine...mount it on the return duct and run the by-pass duct over to the supply above the furnace.
    I need a new signature.....

  5. #5
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    we install on the return and bypass to the plenum 99% of the time. For the reason of dripping on the furnace cabinet, they shouldn't but they all will at some time or another, and its cheaper to replace 4' of return duct than a furnace cabinet.
    You can't fix stupid

  6. #6
    Join Date
    Jan 2008
    Location
    Mississauga
    Posts
    30
    We always install a bypass humidifier on the return. The pad blows off at times if installed on the supply plenum.

  7. #7
    Join Date
    Oct 2004
    Location
    Harrisburg, PA
    Posts
    35
    Your better off going with a steam humidifier on a heat pump system. Even with the new 410 systems the supply air temperature really isn't hot enough to effectively evaporate the water enough to add moisture to the air. Also, because the air isn't as hot as the supply air from an oil or gas fired furnace, it doesn't cause as low of a humidy situation as they do either.
    Jason the Mushroom

  8. #8
    Join Date
    Dec 2007
    Location
    Ohio
    Posts
    2,876
    Quote Originally Posted by siltout View Post
    Your better off going with a steam humidifier on a heat pump system. Even with the new 410 systems the supply air temperature really isn't hot enough to effectively evaporate the water enough to add moisture to the air. Also, because the air isn't as hot as the supply air from an oil or gas fired furnace, it doesn't cause as low of a humidy situation as they do either.
    Correct to a point...putting the water supply on the hot water side of the water heater will help with a bypass humidifier....when we put in heat pump systems with humidifiers the water supply is always on the hot side. Steam is a good alternative....but a bypass will do the trick as well.
    I need a new signature.....

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,586
    Also, because the air isn't as hot as the supply air from an oil or gas fired furnace, it doesn't cause as low of a humidy situation as they do either.
    __________________


    Its not the discharge air temp that causes the air in the house to be dryer with gas and oil furnaces.

    Older houses with oil and ND gas furnaces, seem to have higher infiltration in the occupied areas. And its the infiltration that causes the need for a humidifier.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event