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  1. #1
    Join Date
    Sep 2009
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    Question Replacing a 25 yr-old System in a 3 Story Old Victorian

    I am replacing a "single unit" ( 1 condensor - 1 furnace) 8 SEER and 55% efficient furnace. I have gotten multiple bids but would like some opinions.

    House Information: Hardwood throughout, most walls are insulated. I also have a unconditioned basement. Located in St. Louis.

    1-bid: 1 3-Ton 14 SEER condenser for the 1st and 2nd floor with a 75k BTU 92% Furnace. 1 3-Ton 14 SEER condenser for the 2nd and 3rd floor with a second 75k BTU 92% furnace. New duct work for 2nd and 3rd floor. All Equipment is Ducane

    2-bid: 1 3-Ton 16 SEER condenser for the 1st and 2nd floor with a 90k BTU 95% Furnace. 1 3-Ton 13 SEER condenser for the 2nd and 3rd floor with a 15kW air handler. New duct work for 2nd and 3rd floor. All Equipment is Goodman.

    All costs are the same and is not issue, Any suggestions?
    Thanks

  2. #2
    Join Date
    May 2009
    Posts
    196
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    Old, multi story, houses are very hard to heat and cool effectively. Doing the all the design math is essential.

    Did either bidder do a room-by-room Manual J load calculation? Manual D duct sizing calculation? Manual S equipment sizing? If not, ditch the bids and keep looking for a contractor who's prepared to do the job right.


    You're on the right track to install two systems. They just have to be sized properly.

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