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Here are a few measure that may be useful.

The Inject IDF Objects measure is a basic measure where you provide tge path to an IDF file and it adds those objects in prior to simulation. This works fine when the objects you want to add don't need to interact with the model. Just as if you copied and pasted new content into your IDF after exporting from OpenStudio but before running it through EnergyPlus.

the Inject OSM Geometry into an External IDF measure has a different workflow, demonstrated in this video. The basic concept is to import an IDF file into OpenStudio to work on geometry, this could be in the plugin or using measures in the stand alone OpenStudio application. Then run this measure to merge that geometry back into your original IDF file. This basically allows you to use the new OpenStudio in place of the legacy plugin, but you get many of the benefits of the newer version of OpenStudio like measures.

To @ljbrackney's point, please let us know what HVAC objects you are trying to use.

Here are a few measure measures that may be useful.

The Inject IDF Objects measure is a basic measure where you provide tge the path to an IDF file and it adds those objects in prior to simulation. This works fine when the objects you want to add don't need to interact with the model. Just as if you copied and pasted new content into your IDF after exporting from OpenStudio but before running it through EnergyPlus.

the Inject OSM Geometry into an External IDF measure has a different workflow, demonstrated in this video. The basic concept is to import an IDF file into OpenStudio to work on geometry, this could be in the plugin or using measures in the stand alone OpenStudio application. Then run this measure to merge that geometry back into your original IDF file. This basically allows you to use the new OpenStudio in place of the legacy plugin, but you get many of the benefits of the newer version of OpenStudio like measures.

To @ljbrackney's point, please let us know what HVAC objects you are trying to use.