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  1. #1

    New Furnace Sizing

    I purchased a 3500 square ft home in Dyer, IN and I have a contractor ready to replace my 140 000 BTU furance with a Trane 104 500 BTU furnace. The old AC unit tonage is unknown and this guy recomends a 3.5 Ton unit and a 4 Ton coil with a 4 Ton fan. The house is a 2 story, 5 bedrooms, plaster, no insulation with a Mansard flat roof. Also have a 1200 Square ft addition with it's own HVAC unit. All brick for the house and addition. Partially shaded with mature trees. Does this sound right?

  2. #2
    The new Trane unit would be 95% and the old unit was 80%

  3. #3
    Join Date
    Jul 2007
    Location
    Delaware
    Posts
    3,824
    Get a two zone system
    Always here

  4. #4
    Join Date
    Oct 2003
    Location
    Washington
    Posts
    7,405
    Quote Originally Posted by Arthur Mroz View Post
    The new Trane unit would be 95% and the old unit was 80%
    Did he do a load calc?
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