While exporting your building geometry from a Revit Model, you notice one value seems way off? If this value is your Building's Height, it is likely your project is floating far above or far below Revit's project ground. 

How to check:
By opening an elevation or section view from your project browser, check that the Ground or Level 1 Level's Maker is at or near Elevation 0' 0". See image below to compare. In this case the project begins a 2'10" below project ground, but the occupied space begins at 5" above project ground. Exporting this buildings height would then be only 5" over your overall building height which shouldn't be a problem.  

Solution: You have two options to fix this geometry input, option 1 - inside Revit and option 2 - inside cove.tool.
>Option 1: Inside your Revit project, move your project model to line up with the project ground plane. Depending on the stability and complexity of your model this might be a complicated task. Another path for the same outcome is relocating your ground plane elevation marker to 0ft (matching project ground with elevation mark - 0ft). Also If you model is starting at 0ft, then access elevation markers that hang above your projects top element may also skew the results.  
>Option 2, you can overwrite the plug-in generated values with a manual write-in input. This step will not overwrite the Daylight 3D Model Display, but will make the energy analysis model correct. Users can check their buildings actual height in the elevation or section view by using the measure tool in Revit to manually record their building's actual total height. This might be the ideal method if you just skip the model complications that come with moving your project or fixing all of your level marker descriptions. 

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