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The general answer is that those OpenStudio-HPXML inputs are not currently exposed to ResStock. In order for an OpenStudio-HPXML input to be exposed, it needs to be added as an argument to the BuildResidentialHPXML measure, which is the OpenStudio measure ResStock uses to create the HPXML file for simulation.

However, in this particular case, there is another way to set the heating/cooling design temperatures. As the OpenStudio-HPXML documentation explains:

If HeatingDesignTemperature not provided, the 99% heating design temperature is obtained from the DESIGN CONDITIONS header section inside the EPW weather file. If not available in the EPW header, it is calculated from the 8760 hourly temperatures in the EPW."

So you can modify the DESIGN CONDITIONS header section of the EPW weather file to set the heating design temperature. And you can look at in.xml to verify it is being used.