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Energy modeling

Joe Norm | Posted in General Questions on

Is there free modeling software online?

I am building a home and realizing there are a lot of windows. There are nice ocean views, but unfortunately to the North. I was considering exterior insulation but have been reading here that it may not be worthwhile if a big percentage of heat loss is out the windows. 

How does one quantify this information to be able to make that decision?

thanks

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Replies

  1. Expert Member
    Akos | | #1
  2. Jon R | | #2

    +1 on using some software to calculate payback on any energy saving feature. Possibly BEopt.

  3. Expert Member
    Dana Dorsett | | #3

    >"I am building a home and realizing there are a lot of windows. "

    The time to start this type of analysis is while designing the house, not while it's being built. Being selective about location & size, solar gains & U-factors of the windows can make or break it.

    But it's silly to take the position " I was considering exterior insulation but have been reading here that it may not be worthwhile if a big percentage of heat loss is out the windows. " By that kind of thinking you might as well live in a tent. The amount of heat loss per square foot for the walls is the same, independent of how much glass is installed. If it's "...worthwhile..." on a house that has very little glazed area it's also "...worthwhile..." for a house with more glazed area. The total amount of exterior insulation and it's cost scales with the total area being insulated.

  4. GBA Editor
    Peter Yost | | #4

    BEopt is a great free, online energy modeling program. But it is a significant time investment to learn.

    One tool that can help with the impact of glazing performance is the Efficient Windows Collaborative window selection tool: https://www.efficientwindows.org/new_selection1.php.

    Peter

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