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Thread: Day Old Furnace

  1. #14
    Join Date
    Mar 2005
    Location
    burlington county n.j.
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    9,739
    Quote Originally Posted by Sutree View Post
    My current furnace is 50,000 BTUs and 60% efficiency. It is adequate for heating the home (approx. 1,100 sq.ft). The one he is proposing is 70,000 and 80% efficiency. The upside he proposed was quietness and long term savings, but the calculation he gave me was based off a brochure, not off an inspection of the home.


    G61 furnace is 94% efficiency

    replacing an old 50,000 btu with a 94% efficient 70,000 btu would give you a unit that is oversized.

  2. #15
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Trust is a funny thing.

    Homeowners must have some trust to call the contractor in the first place,but then???

    Hoemowners recommend contractors that they trust,but were they wrong to trust them,how do they really know who is the best(if that exists) or at least a good/great contractor,seems they find out once it's too late ,in many cases.

  3. #16
    Join Date
    Nov 2005
    Location
    NJ
    Posts
    11
    Quote Originally Posted by im4snow2000 View Post
    Did he say why it was removed?

    If you can get a warranty same as new, in writing, I don't see the downside.
    I agree.

  4. #17
    Join Date
    Nov 2008
    Location
    Colorado
    Posts
    2,687
    I would always get load calcs done before selecting a unit. If the unit is not sized correctly, the few bucks saved at the begining are lost in the monthly bills. Get the right size unit, because you'll be stuck with it for 20 years.

  5. #18
    Join Date
    Mar 2002
    Location
    Richmond, Virginia
    Posts
    4,264
    Quote Originally Posted by t527ed View Post
    G61 furnace is 94% efficiency

    replacing an old 50,000 btu with a 94% efficient 70,000 btu would give you a unit that is oversized.
    Not to mention that this 90+ furnace will require a completely different venting system. How much will that cost? This furnace is a condensing furnace. Are there any issues with disposing of the condensation during operation? Is there an existing gas water heater that is common vented with the existing furnace? Will the vent be properly sized for the orphaned water heater?

    This is a very nice furnace, but as stated, it would be oversized based on the size of the furnace being replaced. A load study would determine if it is a correct fit.
    There is nothing more frightful than ignorance in action....Mark Twain

  6. #19
    Join Date
    Jan 2009
    Posts
    6
    Quote Originally Posted by HVAC Pro View Post
    Not to mention that this 90+ furnace will require a completely different venting system. How much will that cost? This furnace is a condensing furnace. Are there any issues with disposing of the condensation during operation? Is there an existing gas water heater that is common vented with the existing furnace? Will the vent be properly sized for the orphaned water heater?

    This is a very nice furnace, but as stated, it would be oversized based on the size of the furnace being replaced. A load study would determine if it is a correct fit.
    I am very confused. He said it was 80%, but I don't see efficiency in the literature. I need to go back and ask.

    I am not sure what a condensing furnace is, but I do have a water heater right next to the existing furnace. He said no change in ductwork was required. I asked a lot of questions about ductwork, etc., and he said, No change was needed, but whatever is required, we will do.

  7. #20
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,739
    double check the model #.

    G60 = 2 stage 80% afue
    G61 = 2 stage 94% afue

  8. #21
    Join Date
    Jan 2009
    Posts
    6
    I'm sorry, it was a G60V.

    It seems the consensus is that it is safe to go with the "used" furnace. The only question seems to be whether it is oversized for my application.

    Another contractor suggested a Trane TUD 60,000 BTU, 2-stage 80% efficiency.

    Other contractor suggested a Carrier 1-stage 58DLA, 45,000 BTU 80% efficiency. He also quoted a 2-stage for slightly more money; 58CTA, 45,000 BTU 80% efficiency. The cost difference is neglible. My only concern is that this will be undersized, but he seemed to think that this would do just fine.

    I guess my problem is that I don't know how to determine what my needs are. One person says my needs are modest; another person seems to say I need more.

  9. #22
    Join Date
    Mar 2002
    Location
    Richmond, Virginia
    Posts
    4,264
    G60V is a very nice 80% 2 stage furnace with variable speed blower. A manual J load study is the only way of knowing what size furnace you need. If you're comfortable enough click on the HVAC Calc link at the top of the page and purchase the homeowner version of the program and do it yourself. Here's the link to the G60V in case you haven't found it yet. Good luck! http://www.lennox.com/products/overview.asp?model=G60V
    There is nothing more frightful than ignorance in action....Mark Twain

  10. #23
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,910
    Does/did your curretn furnace, cycle on and off, when you were at your colest winter temps.

    If so, then the 45,000 BTU furnaces will work for your house.
    Contractor locator map

    How-to-apply-for-Professional

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

  11. #24
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,739
    since it is a G60uhv-070 the actual input btus on high fire are 66,000 with 54,000 output.

    on low fire it is 45,000 input with 36,000 output.

    does not sound like it would really be oversized, it may just not go into high fire very much.

    if the guy is giving you a good deal and full warranty it sounds good.

    G60V is a nice quiet furnace.

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