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15 btu/sq. ft?

Constantin
Constantin Member Posts: 3,796
... if the local design conditions are right. The heat losses calculated for the home I live in are similar (Wrightsoft and HVAC-Calc) for -10°F and 91*deg;F exterior conditions. Our home also features some of the same construction techniques.

Comments

  • Matt_21
    Matt_21 Member Posts: 140
    just did he load calc

    for a new 3500 sq ft residence with hvac calc. 3 floors, 1st, 2nd, and finished attic. 2x6 walls w r-19, double pane low e windows. r-30 in attic. total cooling load 46,278 btu, heating 58,607. these work out to 13 btu/sq ft and 17 btu/sq. ft. do these seem accurate.
  • Scary, huh?

    I consistently get 17 BTU's/[] for new residential construction. Trust your numbers.

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  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
    Alan Said it Right!

    TRUST YOUR NUMBERS!

    And opt for a boiler size closest to but not exceeding!

    If you're really scared, recalculate your heat loss at 78F indoor temp.
  • R. Kalia_8
    R. Kalia_8 Member Posts: 54


    I'm confused. Doesn't this depend on where the house is?

    My 1920's brick house in N. Illinois (design temp -10F) needs 40 BTU/sqft. So 15 BTU/sqft for new construction, presumably in a warmer climate, seems awfully high. I've always suspected that those heat loss calcs are hugely padded so you can never go wrong.
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