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  1. #1
    Join Date
    Oct 2005
    Location
    Hockessin,DE
    Posts
    88
    How much more efficient are 2 stage units compared to standard units?
    What's the usual payoff period for them in a moderatley cold area like Delaware

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,607
    2 stage furnaces are for comfort, there is no efficiency gain.

  3. #3
    Join Date
    Oct 2005
    Location
    Hockessin,DE
    Posts
    88

    thought that was the case with variable speed

    i was told by contractor that 2 stages give you a good boost in efficiency without upgrading to the next AFUE.
    he also said the variable speeds are the ones that are mostly a "confort" factor than efficiency

  4. #4
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    Contractor is wrong.

  5. #5
    Join Date
    Oct 2005
    Location
    Hockessin,DE
    Posts
    88

    ok may be my question should've been...

    is there a saving on "heating bill" in upgrading to a 2 stage.

  6. #6
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    No saving,just comfort,for two stages.

    Variable speed fan ,comfort and likely some savings on electric for the fan.

  7. #7
    Join Date
    Aug 2005
    Posts
    833
    Some people even say that you lose efficiency on low fire.
    eventu rerum stolidi didicere magistro

  8. #8
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,782

    Re: thought that was the case with variable speed

    Originally posted by shaum76
    i was told by contractor that 2 stages give you a good boost in efficiency without upgrading to the next AFUE.
    If it gave an efficency boost, then it would have a higher AFUE rating.
    Contractor locator map

    How-to-apply-for-Professional

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

  9. #9
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    Originally posted by cg2
    Some people even say that you lose efficiency on low fire.
    Yes. Excessive combustion air reduces efficiency.

  10. #10
    Join Date
    Feb 2005
    Posts
    655

    Two Stage

    If a home has a heat load net 50,000 btuh, that means that amount of energy is needed in extreem conditions ( 0 degree
    and maitain 75 to 80. More than 80% of the time you do not see
    those temps in New England. (I live in Mass.)So if you have a two stage unit which is 40/60 input it only makes sence to me that running on 40,000 btu input would be a very good thing.

  11. #11
    Join Date
    Mar 2003
    Location
    PA/DE area
    Posts
    1,535
    In Delaware we found that it makes the home alot more comfortable,due to longer run times,not the BIG BLAST and then OFF and then on again.Some of the places in Wilmington we have taken out the eletric baseboard in some rooms that needed them with the old heaters.
    It's NOT the BRAND,it's the company that installs it!!!!!

  12. #12
    Join Date
    Mar 2005
    Location
    Indianapolis, IN
    Posts
    241
    > it gave an efficency boost, then it would have a higher AFUE rating.

    May be I am wrong, but the only scenario I can see how 2 stage can provide boost in the efficiency is in combination with zoning system, when small zone calls low fire.


  13. #13
    Join Date
    Feb 2005
    Posts
    655

    I Disagree


    If you have two same 92% furnaces side by side and the single stage is 50,000 input , The two stage is 35/50 input you tell me which one will be more efficient operating for a season. ( More efficient meaning will burn less fuel for that
    season)

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