Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
After some digging, it seems that it has to do with how the ventilation fan is functioning. When the home is tighter, the exhaust fan uses more energy. I've also found that there is an incremental cost associated with going to lower ACHs that can be configured in the option manager.
By using the Central Fan Integrated System CFIS, I was able to get clearer results for what I wanted (a home without a forced supply or exhaust system that has fresh air simply ducted into the return). Thank you.
