I am working on the design of my Pretty Good House up here in Zone 6A (MSP). 1715 sq. ft on the main level, with a lower level that is to be partially finished.  Basic 2×6 walls with ZIP R-12 and the PWF (lower-level) are 2×8 walls with 2″ continuous insulation (per Building Science Corporation).  Plans were done in Chief Architect, then I exported the design in Autocad format so they can “traced” in Wrightsoft.

A block load calculation using data exported from Chief shows a heat-load of 20K BTU per hour – to help ballpark the number. Wrightsoft is showing a heat-loss of 52K. When looking the data, I see two conditioned rooms that are side-by-side but show a heat-loss on the shared wall?  Anyone else getting this issue?  Tring to figure out if I should just use my own spreadsheet based on the CAD settings not a trace. 

Also, I am looking for Manual-D to calculate the cooling load in CFM for sizing the ductwork for the ERV and cooling system.  I find the software is using the CFM for heating in the duct calculation despite having radiant panels in the floor, which results in over-sized ducts.   Trying to find the magical setting that tells the software to size the ductwork based on the cooling load.  If anyone has suggestions send them my way. Thanks!