Question-and-Answer Resource for the Building Energy Modeling Community
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For a reference on how the header should be edited, the EPW weather file format is here.
The values that follow "Heating,1,..." in the second line of the file for Design Conditions are best understood from the .stat file that accompanies the EnergyPlus Weather Converter epw files:
Design Stat ColdestMonth DB996 DB990 DP996 HR_DP996 DB_DP996 DP990 HR_DP990 DB_DP990
Units {} {∞C} {∞C} {∞C} {} {∞C} {∞C} {} {∞C} {m/s} {∞C} {m/s} {∞C} {m/s} {deg}
Heating 1 -4.6 -2.6 -12.6 1.3 -0.5 -9.7 1.7 1.9 9.9 10.8 8.9 8.4 2.6 310
DB = Dry Bulb, DP = Dew Point, HR = Relative Humidity, and the subsequent numbers refer to the percentiles.
I ended up changing the second value in Coldest Month to -15°C to set the design temp to 5°F.
