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OK. What are often called storm windows.

Look up the EnergyPlus WindowProperty:StormWindow object. It's pretty straightforward.

Unfortunately, I don't think the OpenStudio SDK supports this feature. You're likely left with either:

• editing by hand the OpenStudio-generated IDF, or
• implement your own EnergyPlus measure (for OpenStudio).

OK. What are often called storm windows.

. Look up the EnergyPlus WindowProperty:StormWindow object. It's pretty straightforward.

straightforward. Unfortunately, I don't think the OpenStudio SDK supports this feature. You're likely left with either:

• editing by hand the OpenStudio-generated IDF, or
• implement your own EnergyPlus measure (for OpenStudio).

OK. What are often called storm windows. Look up the EnergyPlus WindowProperty:StormWindow object. It's pretty straightforward. Unfortunately, I don't think the OpenStudio SDK supports this feature. You're likely left with either:

• editing by hand the OpenStudio-generated IDF, or
• implement your own EnergyPlus measure (for OpenStudio).

EDIT, in response to the follow-up comment:

For greater flexibility (e.g. exterior storm window vs extra interior pane), you can always look into the following EMS features to dynamically switch a subsurface's construction:

• EnergyManagementSystem:ConstructionIndexVariable
• Surface Construction State
• similar to this EMS "thermochromatic window" example
• discussed here

The EMS "thermochromatic window" example was implemented as an OpenStudio measure 8 years ago. I couldn't get to work after a few tries. Haven't taken a deeper dive, though. However, it does provide step-by-step EMS guidance on how to implement something similar. May help.

OK. What are often called storm windows. Look up the EnergyPlus WindowProperty:StormWindow object. It's pretty straightforward. Unfortunately, I don't think the OpenStudio SDK supports this feature. You're likely left with either:

• editing by hand the OpenStudio-generated IDF, or
• implement your own EnergyPlus measure (for OpenStudio).

EDIT, in response to the follow-up comment:

For greater flexibility (e.g. exterior storm window vs extra interior pane), you can always look into the following EMS features to dynamically switch a subsurface's construction:

• EnergyManagementSystem:ConstructionIndexVariable
• Surface Construction State
• similar to this EMS "thermochromatic window" example
• discussed here

The EMS "thermochromatic window" example was implemented as an OpenStudio measure 8 years ago. I couldn't get to work after a few tries. Haven't taken a deeper dive, though. However, it does provide step-by-step EMS guidance on how to implement something similar. May help.