Question-and-Answer Resource for the Building Energy Modeling Community
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if 0 < jan_temp <- this check is causing the measure to return false.
Also, the variables jan_gtemp and feb_gtemp that you're inserting into the string are not defined, and should be jan_temp and feb_temp to match the argument variables.
Other than that, there's no real need to insert the string into an array, since you will only ever have one ground temperature object. I don't think the way you have it would cause a problem with the measure, but FYI.
