I have a couple of questions regarding the HVAC-Calc program and admit I am on a steep learning curve regarding heat loss calculations. I downloaded the program and understand the basic operation, required input data is fairly straight forward. The design that I am trying to enter is a three level home with a finished basement, main living floor and a conditioned attic. The home will be SIP construction with 6” walls and 8” SIP roof. Five of the rooms on the main level will have vaulted ceilings, so there is not attic deck above. The remainder of the main level will have flat ceilings with the attic deck above.
1. Since the program asks for a ceiling height, should I take the average ceiling height for the rooms with vaulted ceilings?
2. The program does not have a SIP roof, should I just use the R-30 roof choice?
3. Should the attic be included as a second floor or should I just include the attic as a vaulted ceiling over that portion of the home and adjust the wall height to account for the gable ends? The attic deck as well as the deck under the main level will be un-insulated.
4. I entered the total length of each exterior wall and a room for each section of exterior wall, since the remainder of the walls are interior, I assume that I should be unconcerned with them since correct? The square footage I entered is the total for each level and not just for the rooms with exterior walls
5. Finally, I have an attached garage that will also be constructed from SIPS with a SIP roof. The garage will be separated from the living areas by a SIP wall. The garage will be partially conditioned (abt 40 degrees in the winter) to prevent the freezing of water lines in our RV. How can this situation be handled by the HVAC-Calc program? I had originally modeled the living areas without the garage. Should I continue this way so that I have a more conservative model?