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Modeling for 179D tax deductions

asked 2019-02-04 22:04:32 -0500

Energy Guy's avatar


Iqq have several high-rise multifamily projects I have been asked to model for 179D tax deductions. My old software is no longer supported for projects completed in 2017. I downloaded Energy Plus which led me to OpenStudio and Sketchup. Modeling the building seemed straight forward.

But once I model the building, how do I know if the HVAC, envelope, and lighting meets the requirements of 179D. Am I missing something?

Sorry if this doesn’t belong in this forum, but I’m stumped and support directed me here.

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answered 2019-02-05 11:48:52 -0500

This document describes the process.

Model the building as is and the ASHRAE 90.1-2007 baseline and then demonstrate that you meet a certain percentage energy cost savings from baseline depending on the deduction you are targeting. There is an OpenStudio measure Create Baseline Building that generates the ASHRAE 90.1-2007 baseline, though there are some minor changes to make for PRM method vs. Appendix G as specified in the report above.

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Asked: 2019-02-04 22:04:32 -0500

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Last updated: Feb 05 '19