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Thread: Old Lennox

  1. #1
    Join Date
    Oct 2006
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    Ok here is the deal

    I recently moved in a house build in 74. The furnace is gas and there is an outdoor condensor for AC. The AC has been upgraded including the replacement of the condensor coil, tubing and condensor itself. The furnace however, is original with the house it is an old Lennox G12D2-82-1. From reading on the unit it says Input:85,000 BTU/HR Bonnet Capacity 65,600 BTU/HR. My home is relatively small only 1,200 SQFT. I am a handyman and a do it yourselfer type of person. I notice it appears that the entire Lennox Cabient can be removed and another furnace can be installed with minor modification of the ducting so that it would mate. The furnace is configured for upflow. I have a couple of questions.

    1. I was told that this furnace is probably a 65.8% AFUE and that I can go with a lower BTU furnace since the newer furnaces have a considerbly higher AFUE is this ture?

    2. Why does it say input capacity 85,000 and bonnet 65,600. When I see furnaces selling which BTUs are they advertising. In other words is this a 65,600 BTU furnace?

    3. I was told again that it wouldn't make any sense going to a 90% AFUE furnace because I won't be able to recoup any of the gains if I'm staying a short time in the house. A 80% would be good enough. The old Lennox that is here works great now.

    4. Does this furnace cabient literly come out. It appears to be a couple of screws on the top for the exhaust and the intake duct on the side and it could literly come out (correct)?

  2. #2
    Join Date
    Sep 2002
    I don't know
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    Handyman are not qualified or licensed to install furnaces.

    Read the rules of this site.

  3. #3
    Join Date
    Nov 2002
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    it seems at least half of the houses I go to the home owner is a "handyman" and knows a little about hvac. After I throw them a few questions almost all of them know nothing about the trade. Call a contractor and spend some money.

  4. #4
    Join Date
    Dec 2002
    Rochester, MN
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    I am for DIY for somethings. but HVAC replacement/instal is not a DIY thing. You are best to hire a pro and let them do the job.

    I used to be in the field, and I still hired my change out a couple of years ago since I don't have all the tools, and also I wanted warranity coverage/support when needed.

    If you read the fine prints on some of the HVAC equipement, you will not get any warranity on them if brought else where than a Pro installed.

  5. #5
    Join Date
    Jun 2004
    Howell, Michigan
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    Please review the site rules before further posting.

    This is not a DIY site.

    Thread closed.

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