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  1. #1
    Join Date
    May 2005
    Location
    Chicago, IL area
    Posts
    8
    This is my first furnace/ac purchase so go easy. What, exactly, is "variable speed" for the furnace? I have been looking at a Trane XL80 with and without "variable speed". In looking at the product brochure, I see a variable speed draft inducer (listed to the XL90), a two speed draft inducer (XL80), and a multi-speed blower motor. I'm sooo confused.
    Also, I'm in a condo unit so the furnace is inside the unit. One installer has mentioned they would be putting extra insulation to make it quieter. How noisy might this unit be compared to a 26 year old General Electric?


  2. #2
    Join Date
    Apr 2004
    Posts
    7,680
    Your not going to like this but odds are its going to be noisier. your old furnace didnt have the inducer motor or inshot burners. It also probably didnt have the drive capacity of the new one.

    A 90+ will be quieter for the most part than an 80+ because the combustion is sealed and the combustion air is brought in from outside which allows the cabinet to be closed versus louvered.

    VS is simply a motor that varies its speed to maintain a constant airflow. In a two stage unit, it will vary airflow based on the selected constant speed and restrictions in the duct. A multispeed motor is just that but its not automatic. It also costs more to operate than a VS motor. And generally the multi-speed (PSC) offers fewer dehumdification options for cooling than a VS.

  3. #3
    Join Date
    Mar 2005
    Location
    Columbia, SC
    Posts
    36
    I agree with the Doc a 90% furnace will be much better for noise control. And the variable speed blower will help with the noise, as it starts it wont sound like a blast off, it will start slowly making it easier on the light sleepers.

  4. #4
    Join Date
    May 2005
    Location
    Chicago, IL area
    Posts
    8
    I was told that I could not use the XV90 in my unit, only an XV80. I have about 850 sq ft in my condo. Is it a matter of size of my unit or size of the furnace? Or ??

  5. #5
    Join Date
    Dec 2002
    Location
    Rochester, MN
    Posts
    5,304
    Both XV90 and XV80 are same in size, and BTU Rating. Only thing i s why the 90 won't work is the venting... Where does the furnace sit now? If it's in the attic, then that's why 90 won't work. if it's up there or in a remote are from the living area, you won't hear the burners.. if it's in the hallway next to the living room, then yes you will hear the burner on 80%

  6. #6
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,709
    90% furnace needs new venting system either sidewall or thru roof. some of the condo assoc around here won't let them be installed.

  7. #7
    Join Date
    Apr 2003
    Location
    Eugene, Oregon
    Posts
    1,209
    You could possibly run the pvc inside the existing flue pipe however it must be large enough to accomodate 2 2" pipes. You can be creative in terminating the pvc without much exposure.
    Proud supporter of Springfield Millers and Oregon Ducks.

  8. #8
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,709
    most gas heaters in condos around here have water heater venting into existing flue, so thats out.

  9. #9
    Join Date
    Apr 2003
    Location
    Eugene, Oregon
    Posts
    1,209
    They're you go.
    Proud supporter of Springfield Millers and Oregon Ducks.

  10. #10
    Join Date
    Feb 2005
    Posts
    344
    Martib,

    You may want to consider the new RUUD GPN 80+. The combustion aree is shielded by a solid front door. It is possibly one of the most quiet 80+ furnaces on the market.

    Good luck,

  11. #11
    Join Date
    May 2005
    Location
    Chicago, IL area
    Posts
    8

    Thx and Question on Union Labor

    Thanks for all the comments. I was told that I could not have the 90. The furnace is in a utility room off my hallway and next to the living room in a 880 sq ft condo. The contractor has said that they will add extra insulation to make it as quiet as possible.
    Am I allowed to ask about the difference between union labor and non-union labor - at least in terms of quality of installation? I realize (being a former union person) that union labor is often more expensive and want to find out if a difference in training or education etc. warrants a higher price. Thanks.

  12. #12
    Join Date
    May 2005
    Location
    Chicago, IL area
    Posts
    8

    XV-80

    After reading my first post again, I realized that I mentioned the Trane XL-80 when I'm actually looking at the XV-80. How much different is that unit related to the noise?

  13. #13
    Join Date
    Dec 2002
    Location
    Rochester, MN
    Posts
    5,304
    Have they told you WHY you couldn't have a 90%??

    XV80 is going to be quiet with the blower motor vs the XL.. They are both still 2 stage heating, just the blower is diffrent.

    I still would go variable speed since it's in your home, and not in the basement/garage.

    Make sure room has make up air for the 80%

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