Below are some helpful hints to consider when configuring floors in Cool Calc.
Floors over conditioned spaces do not effect load calculations and should not be accounted for. ACCA Manual J only requires floors separating conditioned and unconditioned spaces to be added. For example, a floor over an unheated garage, or a floor over a crawlspace.
Finished Basements - If the home has a finished basement that is conditioned, then "Basement Floor" should be selected as the Floor Type. Do not select this option if the basement is not heated or cooled.
Concrete Slab on Grade - There are two options in this section that tend to give users issues ("Soil Condition Below Slab" and "Slab Insulation Arrangement". These are tricky, because they are difficult to verify. Good news, Cool Calc automatically adds or omits slab insulation and also determined soil conditions based on the year that the house was built and the location. If you do not know what to enter for these values, we recommend accepting the defaults.
Radiant Flooring - If the home has radiant heating under the floors make sure to select "Radiant Floor Heat" = TRUE. Cool Calc will automatically make the necessary adjustments to the heating temperature difference across the floor since the HTD values for a radiant floor are considerably higher than a standard HTD.
Cool Calc will also omit the radiant floor load from the duct load calculations since duct load is calculated as a percentage of the load subtotal.