Question-and-Answer Resource for the Building Energy Modeling Community
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OpenStudio does NOT have a global parameter function like in eQuest. Instead, OS has the ability for the user to write measures that can do pretty much anything. For your case, you can write a measure to change all the window heights. There is also already a measure that changes the window to wall ratio of your building on the Building Component Library found here BCL Window Measures
Here is a good resource for learning how to write measures: OS Measure Writing Guide
